Examine source code of Worthy for Firefox

{
  "manifest_version": 2,
  "version": "0.12resigned1",
  "name": "Worthy for Firefox",
  "description": "Detect and controll VG-Wort-Markers embeded in webpages",
  "icons": {
    "16": "assets/icon-16-enabled.png",
    "64": "assets/icon-64-enabled.png"
  },
  "permissions": [
    "webNavigation",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "browser_action": {
    "default_title": "Worthy for Firefox",
    "default_icon": {
      "16": "assets/icon-16-enabled.png",
      "64": "assets/icon-64-enabled.png"
    }
  },
  "background": {
    "scripts": [
      "worthy-main.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2c6f6b19-1bfa-44f2-82af-52ec3ba96cb7}"
    }
  }
}