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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "Gmail++",
  "version": "1.1.0",
  "description": "Improves the user experience of Gmail",
  "icons": {
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png"
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "*://mail.google.com/"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://mail.google.com/*"
      ],
      "js": [
        "lib.js",
        "main.js"
      ],
      "run_at": "document_end"
    }
  ],
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "gmail-plus-plus@pfaff.dev"
    }
  }
}