feat: add AI services and developer/support sites to built-in domains

New AI sites: Perplexity, Copilot, DeepSeek, HuggingChat, Poe
Developer/support: GitHub, GitLab, Reddit (www + old), Stack Overflow, Pastebin

The existing interception is service-agnostic — it scans all JSON strings
in POST/PUT/PATCH requests through the 4-stage substitution pipeline.
No site-specific handling needed; all sites use the same method.

https://claude.ai/code/session_01KF4i7Ra7zCEDskxDBaNtcT

manifest.firefox.json

@@ -23,6 +23,17 @@
     "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/*"
   ],
@@ -39,6 +50,17 @@
         "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/*"
       ],

manifest.json

@@ -17,6 +17,17 @@
     "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/*"
   ],
@@ -33,6 +44,17 @@
         "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/*"
       ],

src/background/service-worker.js

@@ -21,12 +21,26 @@ const tabCounts = new Map();
 
 // Built-in URL patterns
 const BUILTIN_URL_PATTERNS = [
+  // AI services
   'https://claude.ai/*',
   'https://chatgpt.com/*',
   'https://chat.openai.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/*',
+  // Developer & support sites
+  'https://github.com/*',
+  'https://gitlab.com/*',
+  'https://www.reddit.com/*',
+  'https://old.reddit.com/*',
+  'https://stackoverflow.com/*',
+  'https://pastebin.com/*',
+  // Local
   'http://localhost/*',
   'http://127.0.0.1/*',
 ];

src/options/options.js

@@ -603,7 +603,7 @@ function renderDomains() {
   const domains = settings.customDomains || [];
 
   if (domains.length === 0) {
-    safeHTML(list, '<div style="text-align:center;color:#9ca3af;padding:12px;font-size:13px">No custom domains. Built-in sites (Claude, ChatGPT, Grok, Gemini, localhost) are always active.</div>');
+    safeHTML(list, '<div style="text-align:center;color:#9ca3af;padding:12px;font-size:13px">No custom domains. Built-in sites (Claude, ChatGPT, Gemini, Grok, Perplexity, Copilot, DeepSeek, HuggingChat, Poe, GitHub, GitLab, Reddit, Stack Overflow, Pastebin, localhost) are always active.</div>');
     return;
   }