diff --git a/README.md b/README.md
index acbecc9..de2004c 100644
--- a/README.md
+++ b/README.md
@@ -8,13 +8,16 @@ A browser extension (Chrome, Firefox, and Safari) that intercepts personal infor
 |---------|---------|--------|
 | Claude | claude.ai, claude.ai/code | Tested |
 | ChatGPT | chatgpt.com, chat.openai.com | Tested |
+| Copilot | copilot.microsoft.com | Untested |
 | Grok | grok.x.ai, x.com/i/grok | Untested |
 | Gemini | gemini.google.com | Untested |
 | OpenWebUI | localhost, 127.0.0.1, or custom domain | Untested |
 
-> **Note:** Only Claude has been tested so far. The other services have API interception patterns defined but may need adjustments. PRs welcome.
+> **Browsers:** Chrome, Edge, Brave, Firefox, and Safari. Edge and Brave use the Chrome extension directly.
 >
-> **Browsers:** Chrome, Firefox (signed .xpi), and Safari (via Xcode project). All three use the same core code.
+> **Desktop apps** (Claude, ChatGPT, Copilot) bypass the browser — use the web version with the extension for PPI protection.
+>
+> **Note:** Claude and ChatGPT are tested. Other services have interception patterns defined but may need adjustments. PRs welcome.
 
 ## How it works
 
diff --git a/manifest.firefox.json b/manifest.firefox.json
index 880e480..06b89a3 100644
--- a/manifest.firefox.json
+++ b/manifest.firefox.json
@@ -20,6 +20,7 @@
     "https://claude.ai/*",
     "https://chatgpt.com/*",
     "https://chat.openai.com/*",
+    "https://copilot.microsoft.com/*",
     "https://grok.x.ai/*",
     "https://x.com/i/grok*",
     "https://gemini.google.com/*",
@@ -36,6 +37,7 @@
         "https://claude.ai/*",
         "https://chatgpt.com/*",
         "https://chat.openai.com/*",
+        "https://copilot.microsoft.com/*",
         "https://grok.x.ai/*",
         "https://x.com/i/grok*",
         "https://gemini.google.com/*",
diff --git a/manifest.json b/manifest.json
index 8ff33ee..69b4644 100644
--- a/manifest.json
+++ b/manifest.json
@@ -14,6 +14,7 @@
     "https://claude.ai/*",
     "https://chatgpt.com/*",
     "https://chat.openai.com/*",
+    "https://copilot.microsoft.com/*",
     "https://grok.x.ai/*",
     "https://x.com/i/grok*",
     "https://gemini.google.com/*",
@@ -30,6 +31,7 @@
         "https://claude.ai/*",
         "https://chatgpt.com/*",
         "https://chat.openai.com/*",
+        "https://copilot.microsoft.com/*",
         "https://grok.x.ai/*",
         "https://x.com/i/grok*",
         "https://gemini.google.com/*",
diff --git a/src/background/service-worker.js b/src/background/service-worker.js
index 98148bb..f7c0963 100644
--- a/src/background/service-worker.js
+++ b/src/background/service-worker.js
@@ -24,6 +24,7 @@ const BUILTIN_URL_PATTERNS = [
   'https://claude.ai/*',
   'https://chatgpt.com/*',
   'https://chat.openai.com/*',
+  'https://copilot.microsoft.com/*',
   'https://grok.x.ai/*',
   'https://x.com/i/grok*',
   'https://gemini.google.com/*',