Examine source code of Open-Source Alternative

{
  "manifest_version": 2,
  "name": "Open-Source Alternative Redirector",
  "version": "9.0.0",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "/index.js"
      ]
    }
  ],
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "38": "/icon.png"
    },
    "default_title": "Open-Source Alternative Redirector",
    "default_popup": "/index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e831b704-7584-444b-9412-0b837bd23881}"
    }
  }
}