Examine source code of Time Zone Spoofer

{
  "manifest_version": 2,
  "name": "Time Zone Spoofer",
  "version": "2.1",
  "description": "Report a time zone of your choosing to sites you nominate.",
  "permissions": [
    "storage",
    "*://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "spoof.js"
      ],
      "run_at": "document_start",
      "all_frames": true,
      "match_about_blank": true,
      "world": "MAIN"
    },
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "bridge.js"
      ],
      "run_at": "document_start",
      "all_frames": true,
      "match_about_blank": true
    }
  ],
  "web_accessible_resources": [
    "spoof.js"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{be5072bf-dc1a-45cd-8c83-c34d69bd3035}",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}