Examine source code of IblockU

{
  "name": "IblockU",
  "version": "1.0",
  "description": "A simple adblocker",
  "icons": {
    "48": "Icon.png"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "http://*/",
    "https://*/"
  ],
  "background": {
    "scripts": [
      "blocked_domains.js",
      "background.js"
    ]
  },
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{d119718d-9d10-4513-a907-9268c34e550e}"
    }
  }
}