Examine source code of AD Blocker add-on

{
  "manifest_version": 2,
  "name": "AdBlocker",
  "description": "Blocking ads.",
  "version": "0.0.3",
  "author": "Ranjith",
  "browser_action": {
    "default_title": "AdBlocker"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "icons/16by16.png",
    "48": "icons/48by48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f906d051-2c29-467c-940f-cb3bffaf45cf}"
    }
  }
}