Examine source code of Quick Locale Switcher

{
  "manifest_version": 2,
  "name": "Quick Locale Switcher",
  "description": "An Extension for Firefox to easily change the language and locale.",
  "version": "0.2resigned1",
  "applications": {
    "gecko": {
      "id": "@quick-locale-switcher"
    }
  },
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
  "permissions": [
    "<all_urls>",
    "activeTab",
    "notifications",
    "webNavigation",
    "webRequest",
    "webRequestBlocking",
    "storage",
    "tabs"
  ],
  "browser_action": {
    "default_icon": "icons/icon.png",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "lib/dojo.js",
      "code/background.js"
    ]
  },
  "options_ui": {
    "page": "options.html"
  }
}