Examine source code of Quick URL Opener

{
  "manifest_version": 2,
  "name": "Quick URL Opener",
  "version": "0.12.0",
  "description": "To quick open standard url where one parameter is changed",
  "homepage_url": "https://github.com/Qwertovsky/quick_url_addon",
  "icons": {
    "128": "icons/icon128.png",
    "256": "icons/icon.png"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/icon.png",
    "default_title": "Quick URL Opener",
    "default_popup": "index.html"
  },
  "options_ui": {
    "page": "options.html"
  },
  "applications": {
    "gecko": {
      "id": "quick-url-opener@qwertovsky.com"
    }
  }
}