Examine source code of Background Changer

{
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "description": "Background Changer , For You Brother",
  "icons": {
    "16": "i/icon16.png",
    "19": "i/icon19.png",
    "32": "i/icon32.png",
    "48": "i/icon48.png",
    "128": "i/icon128.png"
  },
  "manifest_version": 2,
  "name": "Background Changer",
  "permissions": [
    "tabs"
  ],
  "short_name": "For Mozile Background Changer",
  "update_url": "https://clients2.google.com/service/update2/crx",
  "version": "1.1resigned1",
  "web_accessible_resources": [
    "icon48.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a0fb29df-ef2a-4ab8-a155-6c5623ab9a47}"
    }
  }
}