diff --git a/platform/mv3/chromium/manifest.json b/platform/mv3/chromium/manifest.json
index ff981f7c3..72760301c 100644
--- a/platform/mv3/chromium/manifest.json
+++ b/platform/mv3/chromium/manifest.json
@@ -41,15 +41,5 @@
   "storage": {
     "managed_schema": "managed_storage.json"
   },
-  "version": "1.0",
-  "web_accessible_resources": [
-    {
-      "resources": [
-        "/strict-block.html"
-      ],
-      "matches": [
-        "<all_urls>"
-      ]
-    }
-  ]
+  "version": "1.0"
 }
diff --git a/platform/mv3/extension/js/background.js b/platform/mv3/extension/js/background.js
index 5461d671a..087df6101 100644
--- a/platform/mv3/extension/js/background.js
+++ b/platform/mv3/extension/js/background.js
@@ -37,7 +37,6 @@ import {
     dnr,
     localRead, localRemove, localWrite,
     runtime,
-    sessionRemove,
     windows,
 } from './ext.js';
 
@@ -369,10 +368,6 @@ function onMessage(request, sender, callback) {
 async function start() {
     await loadRulesetConfig();
 
-    if ( process.wakeupRun === false ) {
-        sessionRemove('excludedStrictBlockHostnames');
-    }
-
     const rulesetsUpdated = process.wakeupRun === false &&
         await enableRulesets(rulesetConfig.enabledRulesets);
 
diff --git a/platform/mv3/extension/js/ruleset-manager.js b/platform/mv3/extension/js/ruleset-manager.js
index fba403e42..c881d20f8 100644
--- a/platform/mv3/extension/js/ruleset-manager.js
+++ b/platform/mv3/extension/js/ruleset-manager.js
@@ -72,30 +72,6 @@ function getRulesetDetails() {
 
 /******************************************************************************/
 
-function getDynamicRules(...args) {
-    if ( getDynamicRules.promise !== undefined ) {
-        return getDynamicRules.promise;
-    }
-    getDynamicRules.promise = dnr.getDynamicRules(...args).then(rules => {
-        getDynamicRules.promise = undefined;
-        return rules;
-    });
-    return getDynamicRules.promise;
-}
-
-function getSessionRules(...args) {
-    if ( getSessionRules.promise !== undefined ) {
-        return getSessionRules.promise;
-    }
-    getSessionRules.promise = dnr.getSessionRules(...args).then(rules => {
-        getSessionRules.promise = undefined;
-        return rules;
-    });
-    return getSessionRules.promise;
-}
-
-/******************************************************************************/
-
 async function pruneInvalidRegexRules(realm, rulesIn) {
     const rejectedRegexRules = [];
 
@@ -329,12 +305,21 @@ async function updateStrictBlockRules(dynamicRules, sessionRules) {
         toStrictBlock.delete(hn);
     }
     if ( toStrictBlock.size === 0 ) { return; }
+    const manifest = runtime.getManifest();
+    let strictblockPath = '';
+    for ( const war of manifest.web_accessible_resources ) {
+        if ( war.resources.length !== 1 ) { continue; }
+        if ( war.resources[0].startsWith('/strict-block.') === false ) { continue; }
+        strictblockPath = runtime.getURL(war.resources[0]);
+        break;
+    }
+    if ( strictblockPath === '' ) { return; }
     const dynamicRule = {
         id: dynamicRuleId++,
         action: {
             type: 'redirect',
             redirect: {
-                regexSubstitution: `${runtime.getURL('/strict-block.html')}#\\0`,
+                regexSubstitution: `${strictblockPath}#\\0`,
             },
         },
         condition: {
@@ -368,19 +353,18 @@ async function updateStrictBlockRules(dynamicRules, sessionRules) {
 /******************************************************************************/
 
 async function updateDynamicRules() {
-    dynamicRuleId = 1;
-    sessionRuleId = 1;
+    dynamicRuleId = sessionRuleId = 1;
     const dynamicRules = [];
     const sessionRules = [];
     const [
         dynamicRuleIds,
         sessionRuleIds,
     ] = await Promise.all([
-        getDynamicRules().then(rules =>
+        dnr.getDynamicRules().then(rules =>
             rules.map(rule => rule.id)
                 .filter(id => id < TRUSTED_DIRECTIVE_BASE_RULE_ID)
         ),
-        getSessionRules().then(rules => rules.map(rule => rule.id)),
+        dnr.getSessionRules().then(rules => rules.map(rule => rule.id)),
         updateRegexRules(dynamicRules),
         updateRemoveparamRules(dynamicRules),
         updateRedirectRules(dynamicRules),
@@ -429,7 +413,7 @@ async function updateDynamicRules() {
 /******************************************************************************/
 
 async function filteringModesToDNR(modes) {
-    const trustedRules = await getDynamicRules({
+    const trustedRules = await dnr.getDynamicRules({
         ruleIds: [ TRUSTED_DIRECTIVE_BASE_RULE_ID+0 ],
     });
     const trustedRule = trustedRules.length !== 0 && trustedRules[0] || undefined;
diff --git a/platform/mv3/extension/js/strict-block.js b/platform/mv3/extension/js/strict-block.js
index 651b4b50e..616ef6ddb 100644
--- a/platform/mv3/extension/js/strict-block.js
+++ b/platform/mv3/extension/js/strict-block.js
@@ -160,9 +160,7 @@ if ( window.history.length > 1 ) {
     qs$('#bye').style.display = 'none';
 } else {
     dom.on('#bye', 'click', ( ) => {
-        sendMessage({
-            what: 'closeThisTab',
-        });
+        window.close();
     });
     qs$('#back').style.display = 'none';
 }
diff --git a/platform/mv3/firefox/manifest.json b/platform/mv3/firefox/manifest.json
index 9b6deb4b4..703f652b2 100644
--- a/platform/mv3/firefox/manifest.json
+++ b/platform/mv3/firefox/manifest.json
@@ -50,15 +50,5 @@
     "storage"
   ],
   "short_name": "uBO Lite",
-  "version": "1.0",
-  "web_accessible_resources": [
-    {
-      "resources": [
-        "/strict-block.html"
-      ],
-      "matches": [
-        "<all_urls>"
-      ]
-    }
-  ]
+  "version": "1.0"
 }
diff --git a/platform/mv3/make-rulesets.js b/platform/mv3/make-rulesets.js
index cb519e134..6fbe1f6e1 100644
--- a/platform/mv3/make-rulesets.js
+++ b/platform/mv3/make-rulesets.js
@@ -1361,6 +1361,15 @@ async function main() {
     // Patch declarative_net_request key
     manifest.declarative_net_request = { rule_resources: ruleResources };
     // Patch web_accessible_resources key
+    manifest.web_accessible_resources = manifest.web_accessible_resources || [];
+    // Strict-block-related resource
+    const strictblockDocument = `strict-block.${secret}.html`;
+    copyFile('./strict-block.html', `${outputDir}/${strictblockDocument}`);
+    manifest.web_accessible_resources.push({
+      resources: [ `/${strictblockDocument}` ],
+      matches: [ '<all_urls>' ],
+    });
+    // Secondary resources
     const web_accessible_resources = {
         resources: Array.from(requiredRedirectResources).map(path => `/${path}`),
         matches: [ '<all_urls>' ],
diff --git a/platform/mv3/extension/strict-block.html b/platform/mv3/strict-block.html
similarity index 100%
rename from platform/mv3/extension/strict-block.html
rename to platform/mv3/strict-block.html
diff --git a/tools/make-mv3.sh b/tools/make-mv3.sh
index c6b02abdd..287a7b08b 100755
--- a/tools/make-mv3.sh
+++ b/tools/make-mv3.sh
@@ -107,6 +107,7 @@ if [ "$QUICK" != "yes" ]; then
     cp platform/mv3/package.json "$TMPDIR"/
     cp platform/mv3/*.js "$TMPDIR"/
     cp platform/mv3/*.mjs "$TMPDIR"/
+    cp platform/mv3/*.html "$TMPDIR"/
     cp platform/mv3/extension/js/utils.js "$TMPDIR"/js/
     cp -R "$UBO_DIR"/src/js/resources "$TMPDIR"/js/
     cp "$UBO_DIR"/assets/assets.dev.json "$TMPDIR"/