Examine source code of FrameFocus

{
  "manifest_version": 2,
  "name": "FrameFocus",
  "version": "1.0.0",
  "description": "Automatically crop/zoom subtitle area or speaking face when video windows are small or multi-tab. Lightweight frame analysis using canvas.",
  "icons": {
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_script.js"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ],
  "permissions": [
    "storage",
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "framefocus@example.com",
      "strict_min_version": "78.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}