Re-add FF id to manifest

This partially reverts commit 78212e0.

Author: cburkert

app/manifest.json

@@ -45,4 +45,10 @@
     "clipboardWrite",
     "storage"
   ],
+  "browser_specific_settings": {
+    "gecko": {
+      "id": "[email protected]"
+    }
+  }
+
 }