Examine source code of allow24

{
  "manifest_version": 2,
  "name": "allow24",
  "version": "1.0.3resigned1",
  "description": "This plugin is looking for the mirrors of websites, which are included in the lists allow24.com. You get only official mirrors.",
  "homepage_url": "http://allow24.com/",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "http://*.allow24.com/"
  ],
  "icons": {
    "32": "icon32.png",
    "64": "icon64.png",
    "128": "icon128.png"
  },
  "background": {
    "scripts": [
      "script.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c3beae73-9c63-437e-8cc6-4ed55de8e51e}"
    }
  }
}