Examine source code of ADV+

{
  "manifest_version": 3,
  "name": "ADV+",
  "description": "Provides some useful tools for use with advrider.com.",
  "version": "1.11",
  "action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.advrider.com/f/threads/*"
      ],
      "js": [
        "jquery-3.1.1.min.js",
        "content.js"
      ]
    }
  ],
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b249a4d7-4c43-4da1-b341-a8152fe8fb46}"
    },
    "gecko_android": {
      "id": "{b249a4d7-4c43-4da1-b341-a8152fe8fb46}"
    }
  }
}