Examine source code of Commonvoice Options

{
  "name": "Commonvoice Options",
  "version": "1.2.0",
  "description": "A simple extension to add some simple and convenient options.",
  "permissions": [
    "storage",
    "tabs",
    "*://commonvoice.mozilla.org/*"
  ],
  "icons": {
    "16": "images/icon-16x16.png",
    "32": "images/icon-32x32.png",
    "270": "images/icon-270x270.png"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://commonvoice.mozilla.org/*"
      ],
      "js": [
        "js/inject.js"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "images/icon-32x32.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "govarjabara@gmail.com"
    }
  },
  "manifest_version": 2
}