diff --git a/manifest.firefox.json b/manifest.firefox.json
index a780e8e..8396c0b 100644
--- a/manifest.firefox.json
+++ b/manifest.firefox.json
@@ -25,6 +25,7 @@
     "https://chatgpt.com/*",
     "https://chat.openai.com/*",
     "https://copilot.microsoft.com/*",
+    "https://grok.com/*",
     "https://grok.x.ai/*",
     "https://x.com/i/grok*",
     "https://gemini.google.com/*",
@@ -53,6 +54,36 @@
         "https://chatgpt.com/*",
         "https://chat.openai.com/*",
         "https://copilot.microsoft.com/*",
+        "https://grok.com/*",
+        "https://grok.x.ai/*",
+        "https://x.com/i/grok*",
+        "https://gemini.google.com/*",
+        "https://www.perplexity.ai/*",
+        "https://copilot.microsoft.com/*",
+        "https://chat.deepseek.com/*",
+        "https://huggingface.co/chat/*",
+        "https://poe.com/*",
+        "https://github.com/*",
+        "https://gitlab.com/*",
+        "https://www.reddit.com/*",
+        "https://old.reddit.com/*",
+        "https://stackoverflow.com/*",
+        "https://pastebin.com/*",
+        "http://localhost/*",
+        "http://127.0.0.1/*"
+      ],
+      "js": ["src/content/early-hook.js"],
+      "run_at": "document_start",
+      "world": "MAIN",
+      "all_frames": true
+    },
+    {
+      "matches": [
+        "https://claude.ai/*",
+        "https://chatgpt.com/*",
+        "https://chat.openai.com/*",
+        "https://copilot.microsoft.com/*",
+        "https://grok.com/*",
         "https://grok.x.ai/*",
         "https://x.com/i/grok*",
         "https://gemini.google.com/*",
@@ -114,7 +145,7 @@
   ],
   "web_accessible_resources": [
     {
-      "resources": ["src/content/content.js", "src/content/early-hook.js", "src/lib/document-scanner.js"],
+      "resources": ["src/content/content.js", "src/lib/document-scanner.js"],
       "matches": ["<all_urls>"]
     }
   ]
diff --git a/manifest.json b/manifest.json
index 172b26e..f6b01c3 100644
--- a/manifest.json
+++ b/manifest.json
@@ -15,6 +15,7 @@
     "https://chatgpt.com/*",
     "https://chat.openai.com/*",
     "https://copilot.microsoft.com/*",
+    "https://grok.com/*",
     "https://grok.x.ai/*",
     "https://x.com/i/grok*",
     "https://gemini.google.com/*",
@@ -43,6 +44,36 @@
         "https://chatgpt.com/*",
         "https://chat.openai.com/*",
         "https://copilot.microsoft.com/*",
+        "https://grok.com/*",
+        "https://grok.x.ai/*",
+        "https://x.com/i/grok*",
+        "https://gemini.google.com/*",
+        "https://www.perplexity.ai/*",
+        "https://copilot.microsoft.com/*",
+        "https://chat.deepseek.com/*",
+        "https://huggingface.co/chat/*",
+        "https://poe.com/*",
+        "https://github.com/*",
+        "https://gitlab.com/*",
+        "https://www.reddit.com/*",
+        "https://old.reddit.com/*",
+        "https://stackoverflow.com/*",
+        "https://pastebin.com/*",
+        "http://localhost/*",
+        "http://127.0.0.1/*"
+      ],
+      "js": ["src/content/early-hook.js"],
+      "run_at": "document_start",
+      "world": "MAIN",
+      "all_frames": true
+    },
+    {
+      "matches": [
+        "https://claude.ai/*",
+        "https://chatgpt.com/*",
+        "https://chat.openai.com/*",
+        "https://copilot.microsoft.com/*",
+        "https://grok.com/*",
         "https://grok.x.ai/*",
         "https://x.com/i/grok*",
         "https://gemini.google.com/*",
@@ -102,7 +133,7 @@
   ],
   "web_accessible_resources": [
     {
-      "resources": ["src/content/content.js", "src/content/early-hook.js", "src/lib/document-scanner.js"],
+      "resources": ["src/content/content.js", "src/lib/document-scanner.js"],
       "matches": ["<all_urls>"]
     }
   ]
diff --git a/src/content/content.js b/src/content/content.js
index 93ae82e..4e69f94 100644
--- a/src/content/content.js
+++ b/src/content/content.js
@@ -789,7 +789,9 @@
   // Fetch Interception — scans ALL POST requests with a body.
   // Service-agnostic: doesn't depend on URL patterns.
   // ============================================================
-  const originalFetch = window.fetch;
+  // Use the real fetch captured by early-hook.js (before React stored its reference),
+  // or fall back to whatever window.fetch is now if early-hook.js didn't run.
+  const originalFetch = window.__ssOriginalFetch || window.fetch;
 
   // URLs to never touch (static assets, analytics, etc.)
   const SKIP_URL_PATTERNS = [
@@ -805,7 +807,7 @@
     return SKIP_URL_PATTERNS.some(p => p.test(url));
   }
 
-  window.fetch = async function (url, options) {
+  window.__ssInterceptFetch = async function (url, options) {
     if (!settings.enabled || !hasSubstitutions()) {
       return originalFetch.call(this, url, options);
     }
@@ -869,6 +871,16 @@
     return originalFetch.call(this, url, options);
   };
 
+  // Activate the fetch hook. If early-hook.js ran first (world: MAIN, document_start),
+  // it already replaced window.fetch with a wrapper that forwards to __ssInterceptFetch
+  // once __ssReady is true — this catches React/Next.js fetch references stored before
+  // content.js loaded. Otherwise fall back to replacing window.fetch directly.
+  if (window.__ssOriginalFetch) {
+    window.__ssReady = true;
+  } else {
+    window.fetch = window.__ssInterceptFetch;
+  }
+
   // ============================================================
   // XMLHttpRequest Interception — same aggressive approach
   // ============================================================