Examine source code of WebSurf

{
  "background": {
    "scripts": [
      "js/background.js",
      "js/jquery-1.11.3.min.js",
      "js/api.js",
      "js/md5.js",
      "js/date.format.js"
    ]
  },
  "browser_action": {
    "default_icon": "assets/icon/icon-19.png",
    "default_popup": "popup.html",
    "default_title": "Websurf"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "js/blocker.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "description": "Websurf.cz rozšíření pro webový prohlížeč Firefox. Přejeme pohodlné surfování a mnoho kreditů!",
  "homepage_url": "http://websurf.cz",
  "icons": {
    "16": "assets/icon/icon-16.png",
    "19": "assets/icon/icon-19.png",
    "32": "assets/icon/icon-32.png",
    "48": "assets/icon/icon-48.png",
    "64": "assets/icon/icon-64.png",
    "128": "assets/icon/icon-128.png"
  },
  "manifest_version": 2,
  "name": "Websurf",
  "options_page": "options.html",
  "permissions": [
    "tabs",
    "http://*/*",
    "https://*/*",
    "webNavigation",
    "cookies",
    "webRequest",
    "webRequestBlocking",
    "storage"
  ],
  "update_url": "https://clients2.google.com/service/update2/crx",
  "version": "1.2resigned1",
  "applications": {
    "gecko": {
      "id": "info@websurf.cz",
      "strict_min_version": "45.0a1"
    }
  }
}