Examine source code of Block Site

{
  "background": {
    "scripts": [
      "jquery.js",
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/128.png",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "js": [
        "jquery.js",
        "content_script.js"
      ],
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_idle"
    }
  ],
  "name": "Block Site",
  "description": "Block all unwanted websites",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "manifest_version": 2,
  "options_page": "options/options.html",
  "permissions": [
    "contextMenus",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>",
    "tabs"
  ],
  "version": "0.1",
  "web_accessible_resources": [
    "icons/blocked-user.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{061c3177-d0bc-4e23-bd2f-98d3fc71351f}"
    }
  }
}