Examine source code of Sync Watch

{
  "manifest_version": 2,
  "name": "__MSG_appName__",
  "description": "__MSG_appDesc__",
  "version": "1.1.0",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "96": "icons/icon96.png",
    "128": "icons/icon128.png"
  },
  "default_locale": "en",
  "options_ui": {
    "page": "options.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/icon128.png",
    "default_title": "SyncWatch",
    "default_popup": "popup.html"
  },
  "permissions": [
    "<all_urls>",
    "tabs",
    "storage",
    "notifications"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.netflix.com/*"
      ],
      "js": [
        "js/players/netflix/loadNetflix.js"
      ]
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "run_at": "document_end",
      "js": [
        "content-scripts/content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "js/players/netflix/netflix.js"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{7558bb02-8595-4b93-b3bc-9f34319e9c4a}"
    }
  }
}