Examine source code of Adblock Mega

{
  "manifest_version": 2,
  "name": "Adblock Running",
  "version": "1.0",
  "description": "Add blocker.",
  "icons": {
    "48": "icons/addblock2.png"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "http://*/",
    "https://*/"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/content.js"
      ]
    }
  ],
  "background": {
    "page": "background/background1.html"
  },
  "browser_action": {
    "default_icon": "icons/addblock2.png"
  }
}