Examine source code of TestRail+

{
  "manifest_version": 3,
  "name": "TestRail+",
  "version": "3.1.3",
  "icons": {
    "32": "./icons/icon.png"
  },
  "background": {
    "scripts": [
      "./app/background.js"
    ]
  },
  "action": {
    "default_popup": "index.html"
  },
  "permissions": [
    "scripting",
    "storage"
  ],
  "host_permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "TestRail.Plus@hoho.comsci",
      "strict_min_version": "58.0"
    }
  }
}