diff --git a/bubble-server/src/main/java/bubble/rule/AbstractAppRuleDriver.java b/bubble-server/src/main/java/bubble/rule/AbstractAppRuleDriver.java
index f20e7452..01901961 100644
--- a/bubble-server/src/main/java/bubble/rule/AbstractAppRuleDriver.java
+++ b/bubble-server/src/main/java/bubble/rule/AbstractAppRuleDriver.java
@@ -12,17 +12,35 @@ import bubble.model.account.Account;
 import bubble.model.app.AppMatcher;
 import bubble.model.app.AppRule;
 import bubble.model.device.Device;
+import bubble.resources.stream.FilterHttpRequest;
 import bubble.server.BubbleConfiguration;
 import bubble.service.stream.AppPrimerService;
 import com.fasterxml.jackson.databind.JsonNode;
 import com.github.jknack.handlebars.Handlebars;
 import lombok.Getter;
 import lombok.Setter;
+import org.apache.commons.io.input.ReaderInputStream;
+import org.cobbzilla.util.collection.ExpirationMap;
+import org.cobbzilla.util.handlebars.HandlebarsUtil;
+import org.cobbzilla.util.io.FileUtil;
+import org.cobbzilla.util.io.regex.RegexFilterReader;
+import org.cobbzilla.util.io.regex.RegexReplacementFilter;
 import org.cobbzilla.util.system.Bytes;
 import org.cobbzilla.wizard.cache.redis.RedisService;
 import org.springframework.beans.factory.annotation.Autowired;
 
+import java.io.File;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.HashMap;
+import java.util.Map;
+
+import static bubble.ApiConstants.HOME_DIR;
+import static org.cobbzilla.util.daemon.ZillaRuntime.die;
+import static org.cobbzilla.util.daemon.ZillaRuntime.empty;
+import static org.cobbzilla.util.io.regex.RegexReplacementFilter.DEFAULT_PREFIX_REPLACEMENT_WITH_MATCH;
 import static org.cobbzilla.util.json.JsonUtil.json;
+import static org.cobbzilla.util.string.StringUtil.UTF8cs;
 
 public abstract class AbstractAppRuleDriver implements AppRuleDriver {
 
@@ -77,4 +95,97 @@ public abstract class AbstractAppRuleDriver implements AppRuleDriver {
         }
     }
 
+    public static final String DEFAULT_INSERTION_REGEX = "<\\s*head[^>]*>";
+    public static final String DEFAULT_SCRIPT_OPEN = "<meta charset=\"UTF-8\"><script>";
+    public static final String NONCE_VAR = "{{nonce}}";
+    public static final String DEFAULT_SCRIPT_NONCE_OPEN = "<meta charset=\"UTF-8\"><script nonce=\""+NONCE_VAR+"\">";
+    public static final String DEFAULT_SCRIPT_CLOSE = "</script>";
+
+    protected static String insertionRegex (String customRegex) {
+        return empty(customRegex) ? DEFAULT_INSERTION_REGEX : customRegex;
+    }
+
+    protected static String scriptOpen (FilterHttpRequest filterRequest, String customNonceOpen, String customNoNonceOpen) {
+        return filterRequest.hasScriptNonce()
+                ? (empty(customNonceOpen) ? DEFAULT_SCRIPT_NONCE_OPEN : customNonceOpen).replace(NONCE_VAR, filterRequest.getScriptNonce())
+                : (empty(customNoNonceOpen) ? DEFAULT_SCRIPT_OPEN : customNoNonceOpen);
+    }
+
+    protected static String scriptClose (String customClose) {
+        return empty(customClose) ? DEFAULT_SCRIPT_CLOSE : customClose;
+    }
+
+    protected String getSiteJsTemplate (String defaultSiteTemplate) {
+        if (configuration.getEnvironment().containsKey("DEBUG_JS_SITE_TEMPLATES")) {
+            final File jsTemplateFile = new File(HOME_DIR + "/siteJsTemplates/" + requestModConfig().getSiteJsTemplate());
+            if (jsTemplateFile.exists()) {
+                return FileUtil.toStringOrDie(jsTemplateFile);
+            }
+        }
+        return defaultSiteTemplate;
+    }
+
+    private RequestModifierConfig requestModConfig() {
+        if (this instanceof RequestModifierRule) return ((RequestModifierRule) this).getRequestModifierConfig();
+        return die("requestModConfig: rule "+getClass().getName()+" does not implement RequestModifierRule");
+    }
+
+    @Getter(lazy=true) private final String insertionRegex = insertionRegex(requestModConfig().getInsertionRegex());
+
+    @Getter(lazy=true) private final String scriptClose = scriptClose(requestModConfig().getScriptClose());
+
+    protected InputStream filterInsertJs(InputStream in,
+                                         FilterHttpRequest filterRequest,
+                                         Map<String, Object> filterCtx,
+                                         String bubbleJsTemplate,
+                                         String defaultSiteTemplate,
+                                         String siteJsInsertionVar) {
+        final RequestModifierConfig modConfig = requestModConfig();
+        final String replacement = DEFAULT_PREFIX_REPLACEMENT_WITH_MATCH
+                + scriptOpen(filterRequest, modConfig.getScriptOpenNonce(), modConfig.getScriptOpenNoNonce())
+                + getBubbleJs(filterRequest.getId(), filterCtx, bubbleJsTemplate, defaultSiteTemplate, siteJsInsertionVar)
+                + getScriptClose();
+
+        final RegexReplacementFilter filter = new RegexReplacementFilter(getInsertionRegex(), replacement);
+        RegexFilterReader reader = new RegexFilterReader(new InputStreamReader(in), filter).setMaxMatches(1);
+        if (modConfig.hasAdditionalRegexReplacements()) {
+            for (BubbleRegexReplacement re : modConfig.getAdditionalRegexReplacements()) {
+                final RegexReplacementFilter f = new RegexReplacementFilter(re.getInsertionRegex(), re.getReplacement());
+                reader = new RegexFilterReader(reader, f);
+            }
+        }
+
+        return new ReaderInputStream(reader, UTF8cs);
+    }
+
+    protected String getBubbleJs(String requestId,
+                                 Map<String, Object> filterCtx,
+                                 String bubbleJsTemplate,
+                                 String defaultSiteTemplate,
+                                 String siteJsInsertionVar) {
+        final Map<String, Object> ctx = getBubbleJsContext(requestId, filterCtx);
+
+        if (!empty(siteJsInsertionVar) && !empty(defaultSiteTemplate)) {
+            final String siteJs = HandlebarsUtil.apply(getHandlebars(), getSiteJsTemplate(defaultSiteTemplate), ctx);
+            ctx.put(siteJsInsertionVar, siteJs);
+        }
+
+        return HandlebarsUtil.apply(getHandlebars(), bubbleJsTemplate, ctx);
+    }
+
+    protected Map<String, Object> getBubbleJsContext(String requestId, Map<String, Object> filterCtx) {
+        final Map<String, Object> ctx = new HashMap<>();
+        ctx.put(CTX_JS_PREFIX, AppRuleDriver.getJsPrefix(requestId));
+        ctx.put(CTX_BUBBLE_REQUEST_ID, requestId);
+        ctx.put(CTX_BUBBLE_HOME, configuration.getPublicUriBase());
+        ctx.put(CTX_SITE, getSiteName(matcher));
+        ctx.put(CTX_BUBBLE_DATA_ID, getDataId(requestId));
+        return ctx;
+    }
+
+    private static final ExpirationMap<String, String> siteNameCache = new ExpirationMap<>();
+    protected String getSiteName(AppMatcher matcher) {
+        return siteNameCache.computeIfAbsent(matcher.getSite(), k -> appSiteDAO.findByAccountAndId(matcher.getAccount(), matcher.getSite()).getName());
+    }
+
 }
diff --git a/bubble-server/src/main/java/bubble/rule/FilterMatchDecision.java b/bubble-server/src/main/java/bubble/rule/FilterMatchDecision.java
index fe2a8d29..5702adba 100644
--- a/bubble-server/src/main/java/bubble/rule/FilterMatchDecision.java
+++ b/bubble-server/src/main/java/bubble/rule/FilterMatchDecision.java
@@ -16,7 +16,7 @@ import static org.cobbzilla.util.http.HttpStatusCodes.OK;
 public enum FilterMatchDecision {
 
     no_match (OK),                // associated matcher should not be included in request processing
-    match (OK),                   // associated should be included in request processing
+    match (OK),                   // associated matcher should be included in request processing
     abort_ok (OK),                // abort request processing, return empty 200 OK response to client
     abort_not_found (NOT_FOUND),  // abort request processing, return empty 404 Not Found response to client
     pass_thru (OK);               // pass-through TLS request, do not intercept
@@ -26,4 +26,6 @@ public enum FilterMatchDecision {
     @Getter private final int httpStatusCode;
     public int httpStatus() { return getHttpStatusCode(); }
 
+    public boolean isAbort () { return this.name().startsWith("abort"); }
+
 }
diff --git a/bubble-server/src/main/java/bubble/rule/RequestModifierConfig.java b/bubble-server/src/main/java/bubble/rule/RequestModifierConfig.java
new file mode 100644
index 00000000..781dd293
--- /dev/null
+++ b/bubble-server/src/main/java/bubble/rule/RequestModifierConfig.java
@@ -0,0 +1,26 @@
+/**
+ * Copyright (c) 2020 Bubble, Inc.  All rights reserved.
+ * For personal (non-commercial) use, see license: https://getbubblenow.com/bubble-license/
+ */
+package bubble.rule;
+
+import lombok.Getter;
+import lombok.Setter;
+import org.cobbzilla.util.collection.NameAndValue;
+
+import static org.cobbzilla.util.daemon.ZillaRuntime.empty;
+
+public class RequestModifierConfig {
+
+    @Getter @Setter private String siteJsTemplate;
+    @Getter @Setter private NameAndValue[] additionalJsTemplates;
+
+    @Getter @Setter private String insertionRegex;
+    @Getter @Setter private String scriptOpenNonce;
+    @Getter @Setter private String scriptOpenNoNonce;
+    @Getter @Setter private String scriptClose;
+
+    @Getter @Setter private BubbleRegexReplacement[] additionalRegexReplacements;
+    public boolean hasAdditionalRegexReplacements () { return !empty(additionalRegexReplacements); }
+
+}
diff --git a/bubble-server/src/main/java/bubble/rule/RequestModifierRule.java b/bubble-server/src/main/java/bubble/rule/RequestModifierRule.java
new file mode 100644
index 00000000..afb44c01
--- /dev/null
+++ b/bubble-server/src/main/java/bubble/rule/RequestModifierRule.java
@@ -0,0 +1,11 @@
+/**
+ * Copyright (c) 2020 Bubble, Inc.  All rights reserved.
+ * For personal (non-commercial) use, see license: https://getbubblenow.com/bubble-license/
+ */
+package bubble.rule;
+
+public interface RequestModifierRule {
+
+    RequestModifierConfig getRequestModifierConfig ();
+
+}
diff --git a/bubble-server/src/main/java/bubble/rule/bblock/BubbleBlockConfig.java b/bubble-server/src/main/java/bubble/rule/bblock/BubbleBlockConfig.java
index ce1d34b7..b9a12875 100644
--- a/bubble-server/src/main/java/bubble/rule/bblock/BubbleBlockConfig.java
+++ b/bubble-server/src/main/java/bubble/rule/bblock/BubbleBlockConfig.java
@@ -4,6 +4,7 @@
  */
 package bubble.rule.bblock;
 
+import bubble.rule.RequestModifierConfig;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 import lombok.Setter;
@@ -14,13 +15,17 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
+import static org.cobbzilla.util.daemon.ZillaRuntime.bool;
 import static org.cobbzilla.util.daemon.ZillaRuntime.empty;
 
 @NoArgsConstructor @Slf4j
-public class BubbleBlockConfig {
+public class BubbleBlockConfig extends RequestModifierConfig {
 
     @Getter @Setter private Boolean inPageBlocks;
-    public boolean inPageBlocks() { return inPageBlocks != null && inPageBlocks; }
+    public boolean inPageBlocks() { return bool(inPageBlocks); }
+
+    @Getter @Setter private Boolean showStats;
+    public boolean showStats() { return bool(showStats); }
 
     @Getter @Setter private BubbleUserAgentBlock[] userAgentBlocks;
     public boolean hasUserAgentBlocks () { return !empty(userAgentBlocks); }
diff --git a/bubble-server/src/main/java/bubble/rule/bblock/BubbleBlockRuleDriver.java b/bubble-server/src/main/java/bubble/rule/bblock/BubbleBlockRuleDriver.java
index 7e4ac12d..3a741d93 100644
--- a/bubble-server/src/main/java/bubble/rule/bblock/BubbleBlockRuleDriver.java
+++ b/bubble-server/src/main/java/bubble/rule/bblock/BubbleBlockRuleDriver.java
@@ -11,25 +11,22 @@ import bubble.model.app.AppRule;
 import bubble.model.device.Device;
 import bubble.resources.stream.FilterHttpRequest;
 import bubble.resources.stream.FilterMatchersRequest;
-import bubble.rule.AppRuleDriver;
 import bubble.rule.FilterMatchDecision;
+import bubble.rule.RequestModifierConfig;
+import bubble.rule.RequestModifierRule;
 import bubble.rule.analytics.TrafficAnalyticsRuleDriver;
 import bubble.service.stream.AppRuleHarness;
 import bubble.service.stream.ConnectionCheckResponse;
 import com.fasterxml.jackson.databind.JsonNode;
 import lombok.extern.slf4j.Slf4j;
-import org.apache.commons.io.input.ReaderInputStream;
-import org.cobbzilla.util.handlebars.HandlebarsUtil;
+import org.apache.commons.collections4.map.SingletonMap;
 import org.cobbzilla.util.http.URIUtil;
-import org.cobbzilla.util.io.regex.RegexFilterReader;
-import org.cobbzilla.util.io.regex.RegexReplacementFilter;
 import org.cobbzilla.util.string.StringUtil;
 import org.glassfish.grizzly.http.server.Request;
 import org.glassfish.jersey.server.ContainerRequest;
 
 import java.io.IOException;
 import java.io.InputStream;
-import java.io.InputStreamReader;
 import java.net.URI;
 import java.util.*;
 import java.util.concurrent.ConcurrentHashMap;
@@ -43,11 +40,10 @@ import static org.cobbzilla.util.http.HttpContentTypes.isHtml;
 import static org.cobbzilla.util.io.StreamUtil.stream2string;
 import static org.cobbzilla.util.json.JsonUtil.COMPACT_MAPPER;
 import static org.cobbzilla.util.json.JsonUtil.json;
-import static org.cobbzilla.util.string.StringUtil.UTF8cs;
 import static org.cobbzilla.util.string.StringUtil.getPackagePath;
 
 @Slf4j
-public class BubbleBlockRuleDriver extends TrafficAnalyticsRuleDriver {
+public class BubbleBlockRuleDriver extends TrafficAnalyticsRuleDriver implements RequestModifierRule {
 
     private final AtomicReference<BlockList> blockList = new AtomicReference<>(new BlockList());
     private BlockList getBlockList() { return blockList.get(); }
@@ -62,6 +58,13 @@ public class BubbleBlockRuleDriver extends TrafficAnalyticsRuleDriver {
 
     @Override public <C> Class<C> getConfigClass() { return (Class<C>) BubbleBlockConfig.class; }
 
+    @Override public RequestModifierConfig getRequestModifierConfig() { return getRuleConfig(); }
+
+    @Override public boolean couldModify(FilterHttpRequest request) {
+        final BubbleBlockConfig config = getRuleConfig();
+        return (config.inPageBlocks() || config.showStats()) && isHtml(request.getContentType());
+    }
+
     @Override public void init(JsonNode config,
                                JsonNode userConfig,
                                AppRule rule,
@@ -170,6 +173,7 @@ public class BubbleBlockRuleDriver extends TrafficAnalyticsRuleDriver {
         final BubbleBlockConfig bubbleBlockConfig = getRuleConfig();
         final BlockDecision decision = getPreprocessDecision(filter.getFqdn(), filter.getUri(), filter.getUserAgent(), filter.getReferer());
         final BlockDecisionType decisionType = decision.getDecisionType();
+        final FilterMatchDecision subDecision;
         switch (decisionType) {
             case block:
                 if (log.isInfoEnabled()) log.info(prefix+"decision is BLOCK");
@@ -178,19 +182,15 @@ public class BubbleBlockRuleDriver extends TrafficAnalyticsRuleDriver {
                 return FilterMatchDecision.abort_not_found;  // block this request
 
             case allow: default:
-                if (filter.hasReferer()) {
-                    final FilterMatchDecision refererDecision = checkRefererDecision(filter, account, device, app, site, prefix);
-                    if (refererDecision != null) return refererDecision;
-                }
+                subDecision = checkRefererAndShowStats(decisionType, filter, account, device, extraLog, app, site, prefix, bubbleBlockConfig);
+                if (subDecision != null) return subDecision;
                 if (log.isInfoEnabled()) log.info(prefix+"decision is ALLOW");
                 else if (extraLog) log.error(prefix+"decision is ALLOW");
                 return FilterMatchDecision.no_match;
 
             case filter:
-                if (filter.hasReferer()) {
-                    final FilterMatchDecision refererDecision = checkRefererDecision(filter, account, device, app, site, prefix);
-                    if (refererDecision != null) return refererDecision;
-                }
+                subDecision = checkRefererAndShowStats(decisionType, filter, account, device, extraLog, app, site, prefix, bubbleBlockConfig);
+                if (subDecision != null) return subDecision;
                 final List<BlockSpec> specs = decision.getSpecs();
                 if (empty(specs)) {
                     if (log.isWarnEnabled()) log.warn(prefix+"decision was 'filter' but no specs were found, returning no_match");
@@ -216,6 +216,23 @@ public class BubbleBlockRuleDriver extends TrafficAnalyticsRuleDriver {
         }
     }
 
+    public FilterMatchDecision checkRefererAndShowStats(BlockDecisionType decisionType, FilterMatchersRequest filter, Account account, Device device, boolean extraLog, String app, String site, String prefix, BubbleBlockConfig bubbleBlockConfig) {
+        if (filter.hasReferer()) {
+            final FilterMatchDecision refererDecision = checkRefererDecision(filter, account, device, app, site, prefix);
+            if (refererDecision != null && refererDecision.isAbort()) {
+                if (log.isInfoEnabled()) log.info(prefix+"decision was "+decisionType+" but refererDecision was "+refererDecision+", returning "+refererDecision);
+                else if (extraLog) log.error(prefix+"decision was "+decisionType+" but refererDecision was "+refererDecision+", returning "+refererDecision);
+                return refererDecision;
+            }
+        }
+        if (bubbleBlockConfig.showStats()) {
+            if (log.isInfoEnabled()) log.info(prefix+"decision was "+decisionType+" but showStats=true, returning match");
+            else if (extraLog) log.error(prefix+"decision was "+decisionType+" but showStats=true, returning match");
+            return FilterMatchDecision.match;
+        }
+        return null;
+    }
+
     public FilterMatchDecision checkRefererDecision(FilterMatchersRequest filter, Account account, Device device, String app, String site, String prefix) {
         prefix = prefix+" (checkRefererDecision): ";
         final URI refererURI = URIUtil.toUriOrNull(filter.getReferer());
@@ -268,10 +285,13 @@ public class BubbleBlockRuleDriver extends TrafficAnalyticsRuleDriver {
         return false;
     }
 
+    public static final String FILTER_CTX_DECISION = "decision";
+
     @Override public InputStream doFilterResponse(FilterHttpRequest filterRequest, InputStream in) {
 
         final FilterMatchersRequest request = filterRequest.getMatchersResponse().getRequest();
         final String prefix = "doFilterResponse("+filterRequest.getId()+"): ";
+        final BubbleBlockConfig bubbleBlockConfig = getRuleConfig();
 
         // todo: add support for stream blockers: we may allow the request but wrap the returned InputStream
         // if the wrapper detects it should be blocked, then the connection cut short
@@ -281,6 +301,7 @@ public class BubbleBlockRuleDriver extends TrafficAnalyticsRuleDriver {
         // Now that we know the content type, re-check the BlockList
         final String contentType = filterRequest.getContentType();
         final BlockDecision decision = getBlockList().getDecision(request.getFqdn(), request.getUri(), contentType, request.getReferer(), true);
+        final Map<String, Object> filterCtx = new SingletonMap<>(FILTER_CTX_DECISION, decision);
         if (log.isDebugEnabled()) log.debug(prefix+"preprocess decision was "+decision+", but now we know contentType="+contentType);
         switch (decision.getDecisionType()) {
             case block:
@@ -312,33 +333,39 @@ public class BubbleBlockRuleDriver extends TrafficAnalyticsRuleDriver {
             return in;
         }
 
-        final String replacement = "<head><script>" + getBubbleJs(filterRequest.getId(), decision) + "</script>";
-        final RegexReplacementFilter filter = new RegexReplacementFilter("<head>", replacement);
-        final RegexFilterReader reader = new RegexFilterReader(new InputStreamReader(in, UTF8cs), filter).setMaxMatches(1);
-        if (log.isDebugEnabled()) {
-            log.debug(prefix+"filtering response for "+request.getUrl()+" - replacement.length = "+replacement.length());
-        } else if (log.isInfoEnabled()) {
-            log.info(prefix+"SEND: filtering response for "+request.getUrl());
+        if (!bubbleBlockConfig.inPageBlocks() && !bubbleBlockConfig.showStats()) {
+            if (log.isInfoEnabled()) log.info(prefix + "SEND: both inPageBlocks and showStats are false, returning as-is");
+            return in;
+        }
+        if (bubbleBlockConfig.inPageBlocks() && bubbleBlockConfig.showStats()) {
+            return filterInsertJs(in, filterRequest, filterCtx, BUBBLE_JS_BOTH_TEMPLATE, null, null);
         }
-        return new ReaderInputStream(reader, UTF8cs);
+        if (bubbleBlockConfig.inPageBlocks()) {
+            return filterInsertJs(in, filterRequest, filterCtx, BUBBLE_JS_TEMPLATE, null, null);
+        }
+        log.warn(prefix+"doFilterResponse: inserting JS for stats...");
+        return filterInsertJs(in, filterRequest, filterCtx, BUBBLE_JS_STATS_TEMPLATE, null, null);
     }
 
     public static final Class<BubbleBlockRuleDriver> BB = BubbleBlockRuleDriver.class;
     public static final String BUBBLE_JS_TEMPLATE = stream2string(getPackagePath(BB)+"/"+ BB.getSimpleName()+".js.hbs");
+    public static final String BUBBLE_JS_STATS_TEMPLATE = stream2string(getPackagePath(BB)+"/"+ BB.getSimpleName()+"_stats.js.hbs");
+    public static final String BUBBLE_JS_BOTH_TEMPLATE = BUBBLE_JS_TEMPLATE + "\n\n" + BUBBLE_JS_STATS_TEMPLATE;
+
     private static final String CTX_BUBBLE_SELECTORS = "BUBBLE_SELECTORS_JSON";
     private static final String CTX_BUBBLE_BLACKLIST = "BUBBLE_BLACKLIST_JSON";
     private static final String CTX_BUBBLE_WHITELIST = "BUBBLE_WHITELIST_JSON";
 
-    private String getBubbleJs(String requestId, BlockDecision decision) {
-        final Map<String, Object> ctx = new HashMap<>();
-        ctx.put(CTX_JS_PREFIX, AppRuleDriver.getJsPrefix(requestId));
-        ctx.put(CTX_BUBBLE_REQUEST_ID, requestId);
-        ctx.put(CTX_BUBBLE_HOME, configuration.getPublicUriBase());
-        ctx.put(CTX_BUBBLE_DATA_ID, getDataId(requestId));
-        ctx.put(CTX_BUBBLE_SELECTORS, json(decision.getSelectors(), COMPACT_MAPPER));
-        ctx.put(CTX_BUBBLE_WHITELIST, json(getBlockList().getWhitelistDomains(), COMPACT_MAPPER));
-        ctx.put(CTX_BUBBLE_BLACKLIST, json(getBlockList().getBlacklistDomains(), COMPACT_MAPPER));
-        return HandlebarsUtil.apply(getHandlebars(), BUBBLE_JS_TEMPLATE, ctx);
+    @Override protected Map<String, Object> getBubbleJsContext(String requestId, Map<String, Object> filterCtx) {
+        final Map<String, Object> ctx = super.getBubbleJsContext(requestId, filterCtx);
+        final BubbleBlockConfig bubbleBlockConfig = getRuleConfig();
+        if (bubbleBlockConfig.inPageBlocks()) {
+            final BlockDecision decision = (BlockDecision) filterCtx.get(FILTER_CTX_DECISION);
+            ctx.put(CTX_BUBBLE_SELECTORS, json(decision.getSelectors(), COMPACT_MAPPER));
+            ctx.put(CTX_BUBBLE_WHITELIST, json(getBlockList().getWhitelistDomains(), COMPACT_MAPPER));
+            ctx.put(CTX_BUBBLE_BLACKLIST, json(getBlockList().getBlacklistDomains(), COMPACT_MAPPER));
+        }
+        return ctx;
     }
 
 }
diff --git a/bubble-server/src/main/java/bubble/rule/social/block/JsUserBlockerConfig.java b/bubble-server/src/main/java/bubble/rule/social/block/JsUserBlockerConfig.java
index a2212604..b0017db6 100644
--- a/bubble-server/src/main/java/bubble/rule/social/block/JsUserBlockerConfig.java
+++ b/bubble-server/src/main/java/bubble/rule/social/block/JsUserBlockerConfig.java
@@ -4,26 +4,6 @@
  */
 package bubble.rule.social.block;
 
-import bubble.rule.BubbleRegexReplacement;
-import lombok.Getter;
-import lombok.Setter;
+import bubble.rule.RequestModifierConfig;
 
-import static org.cobbzilla.util.daemon.ZillaRuntime.empty;
-
-public class JsUserBlockerConfig {
-
-    @Getter @Setter private String siteJsTemplate;
-
-    @Getter @Setter private String insertionRegex;
-    public boolean hasInsertionRegex () { return !empty(insertionRegex); }
-
-    @Getter @Setter private String scriptOpen;
-    public boolean hasScriptOpen () { return !empty(scriptOpen); }
-
-    @Getter @Setter private String scriptClose;
-    public boolean hasScriptClose () { return !empty(scriptClose); }
-
-    @Getter @Setter private BubbleRegexReplacement[] additionalRegexReplacements;
-    public boolean hasAdditionalRegexReplacements () { return !empty(additionalRegexReplacements); }
-
-}
+public class JsUserBlockerConfig extends RequestModifierConfig {}
diff --git a/bubble-server/src/main/java/bubble/rule/social/block/JsUserBlockerRuleDriver.java b/bubble-server/src/main/java/bubble/rule/social/block/JsUserBlockerRuleDriver.java
index e2bab483..0a5f9bd1 100644
--- a/bubble-server/src/main/java/bubble/rule/social/block/JsUserBlockerRuleDriver.java
+++ b/bubble-server/src/main/java/bubble/rule/social/block/JsUserBlockerRuleDriver.java
@@ -4,120 +4,40 @@
  */
 package bubble.rule.social.block;
 
-import bubble.model.app.AppMatcher;
 import bubble.resources.stream.FilterHttpRequest;
 import bubble.rule.AbstractAppRuleDriver;
-import bubble.rule.AppRuleDriver;
-import bubble.rule.BubbleRegexReplacement;
+import bubble.rule.RequestModifierConfig;
+import bubble.rule.RequestModifierRule;
+import bubble.rule.bblock.BubbleBlockConfig;
 import lombok.Getter;
-import org.apache.commons.io.input.ReaderInputStream;
-import org.cobbzilla.util.collection.ExpirationMap;
-import org.cobbzilla.util.handlebars.HandlebarsUtil;
-import org.cobbzilla.util.io.FileUtil;
-import org.cobbzilla.util.io.regex.RegexFilterReader;
-import org.cobbzilla.util.io.regex.RegexReplacementFilter;
+import lombok.extern.slf4j.Slf4j;
 
-import java.io.File;
 import java.io.InputStream;
-import java.io.InputStreamReader;
-import java.util.HashMap;
-import java.util.Map;
 
-import static bubble.ApiConstants.HOME_DIR;
 import static org.cobbzilla.util.http.HttpContentTypes.isHtml;
 import static org.cobbzilla.util.io.StreamUtil.stream2string;
-import static org.cobbzilla.util.io.regex.RegexReplacementFilter.DEFAULT_PREFIX_REPLACEMENT_WITH_MATCH;
 import static org.cobbzilla.util.json.JsonUtil.json;
-import static org.cobbzilla.util.string.StringUtil.UTF8cs;
 import static org.cobbzilla.util.string.StringUtil.getPackagePath;
 
-public class JsUserBlockerRuleDriver extends AbstractAppRuleDriver {
+@Slf4j
+public class JsUserBlockerRuleDriver extends AbstractAppRuleDriver implements RequestModifierRule {
 
     public static final Class<JsUserBlockerRuleDriver> JSB = JsUserBlockerRuleDriver.class;
     public static final String BUBBLE_JS_TEMPLATE = stream2string(getPackagePath(JSB)+"/"+ JSB.getSimpleName()+".js.hbs");
 
     public static final String CTX_APPLY_BLOCKS_JS = "APPLY_BLOCKS_JS";
 
-    public static final String DEFAULT_INSERTION_REGEX = "<\\s*head[^>]*>";
-    public static final String DEFAULT_SCRIPT_OPEN = "<meta charset=\"UTF-8\"><script>";
-    public static final String NONCE_VAR = "{{nonce}}";
-    public static final String DEFAULT_SCRIPT_NONCE_OPEN = "<meta charset=\"UTF-8\"><script nonce=\""+NONCE_VAR+"\">";
-    public static final String DEFAULT_SCRIPT_CLOSE = "</script>";
-
     @Override public boolean couldModify(FilterHttpRequest request) { return true; }
 
-    @Getter(lazy=true) private final JsUserBlockerConfig userBlockerConfig = json(config, JsUserBlockerConfig.class);
-
-    @Override public InputStream doFilterResponse(FilterHttpRequest filterRequest, InputStream in) {
-        if (!isHtml(filterRequest.getContentType())) return in;
-        final String replacement = DEFAULT_PREFIX_REPLACEMENT_WITH_MATCH
-                + getScriptOpen(filterRequest)
-                + getBubbleJs(filterRequest.getId())
-                + getScriptClose();
-
-        final RegexReplacementFilter filter = new RegexReplacementFilter(getInsertionRegex(), replacement);
-        RegexFilterReader reader = new RegexFilterReader(new InputStreamReader(in), filter).setMaxMatches(1);
-        if (getUserBlockerConfig().hasAdditionalRegexReplacements()) {
-            for (BubbleRegexReplacement re : getUserBlockerConfig().getAdditionalRegexReplacements()) {
-                final RegexReplacementFilter f = new RegexReplacementFilter(re.getInsertionRegex(), re.getReplacement());
-                reader = new RegexFilterReader(reader, f);
-            }
-        }
-
-        return new ReaderInputStream(reader, UTF8cs);
-    }
-
-    @Getter(lazy=true) private final String insertionRegex = getUserBlockerConfig().hasInsertionRegex()
-            ? getUserBlockerConfig().getInsertionRegex()
-            : DEFAULT_INSERTION_REGEX;
-
-    public String getScriptOpen(FilterHttpRequest filterRequest) {
-        if (filterRequest.hasScriptNonce()) {
-            // log.info("getScriptOpen: using nonce="+filterRequest.getScriptNonce());
-            return getUserBlockerConfig().hasScriptOpen()
-                    ? getUserBlockerConfig().getScriptOpen().replace(NONCE_VAR, filterRequest.getScriptNonce())
-                    : DEFAULT_SCRIPT_NONCE_OPEN.replace(NONCE_VAR, filterRequest.getScriptNonce());
-        } else {
-            // log.info("getScriptOpen: no nonce");
-            return getUserBlockerConfig().hasScriptOpen()
-                    ? getUserBlockerConfig().getScriptOpen()
-                    : DEFAULT_SCRIPT_OPEN;
-        }
-    }
+    @Override public <C> Class<C> getConfigClass() { return (Class<C>) JsUserBlockerConfig.class; }
 
-    @Getter(lazy=true) private final String scriptClose = getUserBlockerConfig().hasScriptClose()
-            ? getUserBlockerConfig().getScriptClose()
-            : DEFAULT_SCRIPT_CLOSE;
+    @Override public RequestModifierConfig getRequestModifierConfig() { return getRuleConfig(); }
 
-    @Getter(lazy=true) private final String _siteJsTemplate = stream2string(getUserBlockerConfig().getSiteJsTemplate());
+    @Getter(lazy=true) private final String defaultSiteJsTemplate = stream2string(getRequestModifierConfig().getSiteJsTemplate());
 
-    public String getSiteJsTemplate () {
-        if (configuration.getEnvironment().containsKey("DEBUG_JS_SITE_TEMPLATES")) {
-            final File jsTemplateFile = new File(HOME_DIR + "/siteJsTemplates/" + getUserBlockerConfig().getSiteJsTemplate());
-            if (jsTemplateFile.exists()) {
-                return FileUtil.toStringOrDie(jsTemplateFile);
-            }
-        }
-        return get_siteJsTemplate();
-    }
-
-    private String getBubbleJs(String requestId) {
-        final Map<String, Object> ctx = new HashMap<>();
-        ctx.put(CTX_JS_PREFIX, AppRuleDriver.getJsPrefix(requestId));
-        ctx.put(CTX_BUBBLE_REQUEST_ID, requestId);
-        ctx.put(CTX_BUBBLE_HOME, configuration.getPublicUriBase());
-        ctx.put(CTX_SITE, getSiteName(matcher));
-        ctx.put(CTX_BUBBLE_DATA_ID, getDataId(requestId));
-
-        final String siteJs = HandlebarsUtil.apply(getHandlebars(), getSiteJsTemplate(), ctx);
-        ctx.put(CTX_APPLY_BLOCKS_JS, siteJs);
-
-        return HandlebarsUtil.apply(getHandlebars(), BUBBLE_JS_TEMPLATE, ctx);
-    }
-
-    private ExpirationMap<String, String> siteNameCache = new ExpirationMap<>();
-    private String getSiteName(AppMatcher matcher) {
-        return siteNameCache.computeIfAbsent(matcher.getSite(), k -> appSiteDAO.findByAccountAndId(matcher.getAccount(), matcher.getSite()).getName());
+    @Override public InputStream doFilterResponse(FilterHttpRequest filterRequest, InputStream in) {
+        if (!isHtml(filterRequest.getContentType())) return in;
+        log.warn("doFilterResponse: inserting JS, getRequestModifierConfig()="+json(getRequestModifierConfig()));
+        return filterInsertJs(in, filterRequest, null, BUBBLE_JS_TEMPLATE, getDefaultSiteJsTemplate(), CTX_APPLY_BLOCKS_JS);
     }
-
 }
diff --git a/bubble-server/src/main/resources/bubble/rule/bblock/BubbleBlockRuleDriver_stats.js.hbs b/bubble-server/src/main/resources/bubble/rule/bblock/BubbleBlockRuleDriver_stats.js.hbs
new file mode 100644
index 00000000..c78498fc
--- /dev/null
+++ b/bubble-server/src/main/resources/bubble/rule/bblock/BubbleBlockRuleDriver_stats.js.hbs
@@ -0,0 +1,3 @@
+//
+// block stats js goes here
+//
diff --git a/bubble-server/src/main/resources/logback.xml b/bubble-server/src/main/resources/logback.xml
index 95187ddd..78389fcb 100644
--- a/bubble-server/src/main/resources/logback.xml
+++ b/bubble-server/src/main/resources/logback.xml
@@ -53,8 +53,8 @@
 <!--    <logger name="bubble.service.stream.StandardRuleEngineService" level="DEBUG" />-->
     <logger name="bubble.service.stream.ActiveStreamState" level="WARN" />
     <logger name="bubble.resources.stream" level="WARN" />
+<!--    <logger name="bubble.resources.stream.FilterHttpResource" level="DEBUG" />-->
     <logger name="bubble.resources.stream.FilterHttpResource" level="WARN" />
-<!--    <logger name="bubble.resources.stream.FilterHttpResource" level="INFO" />-->
     <logger name="bubble.service.stream" level="INFO" />
 <!--    <logger name="bubble.service.account.StandardAccountMessageService" level="DEBUG" />-->
 <!--    <logger name="bubble.dao.account.message.AccountMessageDAO" level="DEBUG" />-->
diff --git a/bubble-server/src/main/resources/models/apps/bubble_block/bubbleApp_bubbleBlock.json b/bubble-server/src/main/resources/models/apps/bubble_block/bubbleApp_bubbleBlock.json
index 09cb6d6d..5e52b42b 100644
--- a/bubble-server/src/main/resources/models/apps/bubble_block/bubbleApp_bubbleBlock.json
+++ b/bubble-server/src/main/resources/models/apps/bubble_block/bubbleApp_bubbleBlock.json
@@ -126,6 +126,7 @@
       "driver": "BubbleBlockRuleDriver",
       "priority": -1000,
       "config": {
+        "showStats": true,
         "blockLists": [
           {
             "name": "EasyList",
diff --git a/bubble-server/src/main/resources/models/apps/user_block/hn/bubbleApp_userBlock_hn_matchers.json b/bubble-server/src/main/resources/models/apps/user_block/hn/bubbleApp_userBlock_hn_matchers.json
index 869f1b58..91ba2cf5 100644
--- a/bubble-server/src/main/resources/models/apps/user_block/hn/bubbleApp_userBlock_hn_matchers.json
+++ b/bubble-server/src/main/resources/models/apps/user_block/hn/bubbleApp_userBlock_hn_matchers.json
@@ -6,6 +6,7 @@
       "site": "HackerNews",
       "template": true,
       "requestCheck": true,
+      "requestModifier": true,
       "fqdn": "news.ycombinator.com",
       "urlRegex": "/item\\?id=\\d+",
       "rule": "hn_user_blocker"
@@ -14,6 +15,7 @@
       "site": "HackerNews",
       "template": true,
       "requestCheck": true,
+      "requestModifier": true,
       "fqdn": "news.ycombinator.com",
       "urlRegex": "/threads\\?id=\\w+",
       "rule": "hn_user_blocker"