Examine source code of Frame By Frame

{
  "manifest_version": 2,
  "name": "Frame By Frame",
  "description": "__MSG_description__",
  "version": "3.5.1",
  "version_name": "3.5",
  "default_locale": "en",
  "icons": {
    "16": "assets/icons/16.png",
    "32": "assets/icons/32.png",
    "48": "assets/icons/48.png",
    "128": "assets/icons/128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "options-page/index.html"
  },
  "content_scripts": [
    {
      "all_frames": true,
      "css": [
        "content-scripts/styles.css"
      ],
      "js": [
        "content-scripts/core.js",
        "content-scripts/cursor.js",
        "content-scripts/events.js",
        "content-scripts/locale.js",
        "content-scripts/messages.js",
        "content-scripts/observer.js",
        "content-scripts/storage.js",
        "content-scripts/ui.js",
        "content-scripts/videos.js",
        "content-scripts/init.js",
        "content-scripts/features/data.js",
        "content-scripts/features/events.js",
        "content-scripts/features/storage.js",
        "content-scripts/features/ui.js"
      ],
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_start"
    }
  ],
  "optional_permissions": [
    "downloads"
  ],
  "permissions": [
    "<all_urls>",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{c643db31-74c8-4385-be83-6a11248a1f81}"
    }
  }
}