Examine source code of Surfersafe

{
  "manifest_version": 2,
  "name": "PIugin",
  "version": "3.1.0",
  "description": "Session timer control",
  "icons": {
    "128": "icon.png"
  },
  "browser_action": {
    "default_icon": {
      "128": "icon.png"
    },
    "default_popup": "start.html",
    "default_title": "CleanBrowse"
  },
  "background": {
    "scripts": [
      "lk.js"
    ],
    "persistent": true
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "storage",
    "tabs",
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      },
      "id": "{2c18be48-5d2d-4ed5-afdf-8020d490503c}"
    }
  },
  "action": {
    "default_popup": "start.html"
  }
}