Examine source code of Get That API

{
  "name": "Get That API",
  "description": "Test API",
  "version": "3.0.0",
  "manifest_version": 3,
  "action": {
    "default_popup": "index.html",
    "default_icon": "logo.png"
  },
  "icons": {
    "16": "logo.png",
    "32": "logo.png",
    "48": "logo.png",
    "128": "logo.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "getthatapi@firefox.com",
      "strict_min_version": "42.0"
    }
  }
}