Examine source code of CSRF Request Checker

{
  "manifest_version": 2,
  "name": "CSRF Request Checker",
  "version": "1.2",
  "description": "A Mozilla extension to detect, alert, and optionally block potential CSRF vulnerabilities.",
  "permissions": [
    "activeTab",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>",
    "storage",
    "notifications"
  ],
  "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": "{210d8afb-7e41-4731-a59a-ab72ea79cb6d}"
    }
  }
}