Examine source code of Robtex

{
  "manifest_version": 3,
  "name": "Robtex",
  "description": "Shows Robtex info about the site you are on",
  "version": "2.2.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "toolbar@robtex.com",
      "strict_min_version": "115.0",
      "data_collection_permissions": {
        "required": [
          "browsingActivity"
        ]
      }
    }
  },
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon16.png",
      "32": "icon32.png"
    }
  },
  "permissions": [
    "activeTab"
  ],
  "optional_permissions": [
    "tabs"
  ],
  "host_permissions": [
    "https://robtex.com/*"
  ]
}