Examine source code of Video Caption Customizer

{
  "manifest_version": 2,
  "name": "Video Caption Customizer",
  "version": "1.0",
  "description": "Customize video captions appearance and behavior.",
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*",
        "*://www.vimeo.com/*",
        "*://www.netflix.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "options_page": "options.html",
  "browser_action": {
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ca1f8743-bbb5-4c75-8c73-2ba4e428217e}"
    }
  }
}