Examine source code of XSS Detector

{
  "manifest_version": 2,
  "name": "XSS Detector",
  "version": "1.1",
  "description": "A Mozilla extension to detect malicious scripts and prevent Cross-Site Scripting (XSS) attacks.",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>",
    "storage",
    "notifications",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icons/logo_64.png"
  },
  "icons": {
    "64": "icons/logo_64.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{538f98b1-d4b1-4c16-92ec-1c9a36c51d98}"
    }
  }
}