Examine source code of Adblocker

{
  "manifest_version": 2,
  "name": " Adblocker",
  "version": "1.0",
  "description": "Too Many Adds? Here is the Solution",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "blocker.js"
    ]
  },
  "icons": {
    "49": "add blocker.png"
  }
}