Examine source code of GNOME Shell integration

{
  "manifest_version": 3,
  "name": "__MSG_gs_chrome__",
  "short_name": "GS Chrome",
  "description": "__MSG_manifest_description__",
  "version": "12.1",
  "default_locale": "en",
  "author": "Yuri Konotopov <ykonotopov@gnome.org>",
  "icons": {
    "16": "icons/GnomeLogo-16.png",
    "48": "icons/GnomeLogo-48.png",
    "128": "icons/GnomeLogo-128.png"
  },
  "background": {
    "page": "extension.html"
  },
  "action": {
    "default_icon": {
      "16": "icons/GnomeLogo-16.png",
      "32": "icons/GnomeLogo-32.png"
    },
    "default_title": "__MSG_open_website__"
  },
  "content_scripts": [
    {
      "matches": [
        "https://extensions.gnome.org/*",
        "https://extensions-next.gnome.org/*"
      ],
      "run_at": "document_start",
      "js": [
        "include/constants-script.js",
        "include/compat-content-script.js",
        "content-script-start.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "permissions": [
    "nativeMessaging",
    "notifications",
    "storage",
    "tabs"
  ],
  "optional_permissions": [
    "idle"
  ],
  "host_permissions": [
    "https://extensions.gnome.org/",
    "https://extensions-next.gnome.org/"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "include/sweettooth-api.js"
      ],
      "matches": [
        "https://extensions.gnome.org/*",
        "https://extensions-next.gnome.org/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "chrome-gnome-shell@gnome.org",
      "strict_min_version": "126.0"
    }
  }
}