Examine source code of Presenat

{
  "name": "Presenat",
  "version": "0.3.0.2",
  "description": "Leave comments, chat with other visitors wherever you go on the web",
  "manifest_version": 2,
  "permissions": [
    "storage",
    "tabs",
    "http://*/",
    "https://*/"
  ],
  "browser_action": {
    "default_icon": {
      "16": "images/color/Icon_16X16.png",
      "32": "images/color/Icon_32X32.png",
      "48": "images/color/Icon_48X48.png",
      "128": "images/color/Icon_128X128.png"
    },
    "default_title": "Presenat Sidebar"
  },
  "background": {
    "scripts": [
      "background/sync_tab.js",
      "background/sync_service.js",
      "background/background.js"
    ],
    "persistent": true
  },
  "icons": {
    "16": "images/color/Icon_16X16.png",
    "32": "images/color/Icon_32X32.png",
    "48": "images/color/Icon_48X48.png",
    "128": "images/color/Icon_128X128.png"
  }
}