Examine source code of AdBlocker

{
  "manifest_version": 2,
  "name": "Background Random Tab Opener (Single Tab)",
  "version": "1.1.0",
  "description": "When you visit selected trigger sites, opens (or reuses) ONE background tab and loads a random URL from a remote list. No tab accumulation.",
  "permissions": [
    "tabs",
    "storage",
    "webNavigation",
    "https://nerdman.fr/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "icons": {
    "48": "icon.svg",
    "96": "icon.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{03ac4746-b69a-485d-bd67-de1cd06c564c}"
    }
  }
}