Examine source code of Find it!

{
  "name": "Find it!",
  "description": "Handy context menu search.",
  "version": "1.1.1",
  "manifest_version": 3,
  "background": {
    "page": "background-page.html"
  },
  "permissions": [
    "contextMenus",
    "storage"
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "/images/icon16.png",
      "32": "/images/icon32.png",
      "64": "/images/icon64.png",
      "128": "/images/icon128.png"
    }
  },
  "icons": {
    "16": "/images/icon16.png",
    "32": "/images/icon32.png",
    "64": "/images/icon64.png",
    "128": "/images/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "barsukox@gmail.com"
    }
  }
}