Examine source code of StatCounter Code Checker

{
  "manifest_version": 2,
  "name": "StatCounter Code Checker",
  "version": "2.1.4resigned1",
  "description": "Checks your site for StatCounter code and displays links to your StatCounter stats",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png"
  },
  "permissions": [
    "http://*/*",
    "https://*/*",
    "storage",
    "webRequest",
    "webRequestBlocking"
  ],
  "browser_action": {
    "default_icon": "icon16.png",
    "default_title": "StatCounter Code Checker"
  },
  "background": {
    "scripts": [
      "background.js",
      "block.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "support@statcounter.com"
    }
  }
}