Examine source code of LagTV Autolike

{
  "manifest_version": 2,
  "name": "LagTV Autolike",
  "version": "1.0",
  "description": "Automatically likes videos from LagTV",
  "permissions": [
    "tabs",
    "activeTab",
    "https://www.youtube.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/watch*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7b27290b-7433-4840-993b-2e18eb41e4c2}"
    }
  }
}