Examine source code of TestingBot

{
  "manifest_version": 3,
  "name": "TestingBot",
  "description": "Cross Browser Testing on multiple browsers and mobile devices.",
  "version": "1.1",
  "icons": {
    "16": "icons/icon_16.png",
    "32": "icons/icon_32.png",
    "48": "icons/icon_48.png",
    "128": "icons/icon_128.png"
  },
  "action": {
    "default_icon": {
      "16": "icons/icon_16.png",
      "32": "icons/icon_32.png",
      "48": "icons/icon_48.png",
      "128": "icons/icon_128.png"
    },
    "default_popup": "./popup/index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "addon@testingbot.com",
      "strict_min_version": "109.0"
    }
  },
  "externally_connectable": {
    "matches": [
      "https://*.testingbot.com/*"
    ]
  },
  "permissions": [
    "activeTab"
  ]
}