Examine source code of Geething

{
  "manifest_version": 3,
  "name": "Geething",
  "version": "0.10.0",
  "description": "Multi-account Gmail notifications, badge counter, and quick email actions in a toolbar popup.",
  "author": "Geething contributors",
  "homepage_url": "https://github.com/bartekmp/geething",
  "browser_specific_settings": {
    "gecko": {
      "id": "geethingapp@gmail.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "tabs",
    "storage",
    "alarms",
    "notifications",
    "contextMenus"
  ],
  "host_permissions": [
    "https://www.googleapis.com/*",
    "https://gmail.googleapis.com/*",
    "https://accounts.google.com/*",
    "https://oauth2.googleapis.com/*",
    "https://geething.eu/*"
  ],
  "background": {
    "scripts": [
      "background/service-worker.js"
    ],
    "type": "module"
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_title": "Geething — Gmail notifications",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png"
    }
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+G"
      },
      "description": "Open Geething popup"
    }
  }
}