diff --git a/packages/browser-extension/src/manifest.json b/packages/browser-extension/src/manifest.json
index 72c0dab..c964baf 100644
--- a/packages/browser-extension/src/manifest.json
+++ b/packages/browser-extension/src/manifest.json
@@ -60,7 +60,7 @@
     }
   ],
   "host_permissions": ["http://*/*", "https://*/*"],
-  "permissions": ["contextMenus", "declarativeNetRequest", "scripting", "storage"],
+  "permissions": ["contextMenus", "declarativeNetRequest", "scripting", "storage", "webRequest"],
   "web_accessible_resources": [
     {
       "matches": ["http://*/*", "https://*/*"],
diff --git a/packages/browser-extension/src/scripts/background.js b/packages/browser-extension/src/scripts/background.js
index c94fbf9..49c4d04 100644
--- a/packages/browser-extension/src/scripts/background.js
+++ b/packages/browser-extension/src/scripts/background.js
@@ -233,3 +233,43 @@ browser.runtime.onInstalled.addListener(() => {
 browser.runtime.onStartup.addListener(() => {
   refreshData();
 });
+
+/**
+ * @description Listen to the moment before a request is made to apply the rules
+ */
+browser.webRequest.onBeforeRequest.addListener(
+  async (details) => {
+    const { tabId, type, url } = details;
+
+    if (tabId > -1 && type === 'main_frame') {
+      const manifest = browser.runtime.getManifest();
+      const excludeMatches = manifest.content_scripts[0].exclude_matches;
+      const excludePatterns = excludeMatches.map(
+        (match) => `^${match.replaceAll('*.', '*(.)?').replaceAll('*', '.*')}$`
+      );
+
+      if (excludePatterns.some((pattern) => new RegExp(pattern).test(url))) {
+        return;
+      }
+
+      const hostname = url.split('.').slice(-3).join('.').replace('www.', '');
+      const store = await storage.get(hostname);
+      const state = store[hostname] ?? { enabled: true };
+
+      if (state.enabled) {
+        const { data } = await storage.get('data');
+
+        if (data?.rules?.length) {
+          browser.declarativeNetRequest.updateSessionRules({
+            addRules: data.rules.map((rule) => ({
+              ...rule,
+              condition: { ...rule.condition, tabIds: [tabId] },
+            })),
+            removeRuleIds: data.rules.map((rule) => rule.id),
+          });
+        }
+      }
+    }
+  },
+  { urls: ['<all_urls>'] }
+);
diff --git a/packages/browser-extension/src/scripts/content.js b/packages/browser-extension/src/scripts/content.js
index a80be05..fd48417 100644
--- a/packages/browser-extension/src/scripts/content.js
+++ b/packages/browser-extension/src/scripts/content.js
@@ -307,7 +307,9 @@ function filterNodeEarly(node, stopRecursion) {
  * @returns {void}
  */
 function fix() {
-  const backdrops = tokens.backdrops.length ? [...document.querySelectorAll(tokens.backdrops)] : [];
+  const backdrops = tokens.backdrops?.length
+    ? [...document.querySelectorAll(tokens.backdrops)]
+    : [];
   const domains = skips.domains.map((x) => (x.split('.').length < 3 ? `*${x}` : x));
 
   for (const backdrop of backdrops) {
@@ -364,7 +366,9 @@ function fix() {
  * @returns {void}
  */
 function restoreDOM() {
-  const backdrops = tokens.backdrops.length ? [...document.querySelectorAll(tokens.backdrops)] : [];
+  const backdrops = tokens.backdrops?.length
+    ? [...document.querySelectorAll(tokens.backdrops)]
+    : [];
 
   for (const backdrop of backdrops) {
     if (backdrop.children.length === 0 && backdrop.hasAttribute(dataAttributeName)) {
@@ -431,10 +435,10 @@ async function setUp(params = {}) {
   if (state.enabled) {
     const data = await dispatch({ hostname, type: 'GET_DATA' });
 
-    commonWords = data.commonWords ?? commonWords;
-    fixes = data.fixes ?? fixes;
-    skips = data.skips ?? skips;
-    tokens = data.tokens ?? tokens;
+    commonWords = data?.commonWords ?? commonWords;
+    fixes = data?.fixes ?? fixes;
+    skips = data?.skips ?? skips;
+    tokens = data?.tokens ?? tokens;
 
     if (count > 0) {
       dispatch({ type: 'SET_BADGE', value: `${count}` });