Examine source code of ViewCached

{
  "name": "ViewCached",
  "description": "Checks the cached version of the site on ViewCached.com",
  "version": "1.2resigned1",
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_title": "Check the cached version of the site on ViewCached.com",
    "default_icon": "viewcached.png"
  },
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{52759a3d-0deb-4e8c-bf2a-cc32850d669a}"
    }
  }
}