Examine source code of MonoTranslate

{
  "manifest_version": 2,
  "name": "MonoTranslate",
  "version": "1.0",
  "description": "Плагин для мгновенного перевода страницы на Русский",
  "permissions": [
    "tabs",
    "activeTab",
    "webNavigation",
    "*://*/*"
  ],
  "icons": {
    "48": "image/ic.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "src/index.js",
        "src/selectionTranslate.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "monotranslate@github.com"
    }
  },
  "background": {
    "scripts": [
      "src/background.js"
    ]
  },
  "browser_action": {
    "default_icon": "image/ic.png",
    "default_title": "MonoTranslate",
    "default_popup": "src/index.html"
  }
}