Examine source code of Don't Close Window

{
  "manifest_version": 2,
  "name": "Don't Close Window Whit Last Tab",
  "version": "1.1resigned1",
  "version_name": "1.0 RC1",
  "description": "Lorem ipsum dolor sit amet.",
  "author": "Ushiosan23",
  "icons": {
    "16": "src/res/img/logo.png",
    "48": "src/res/img/logo.png",
    "128": "src/res/img/logo.png"
  },
  "options_page": "src/options.html",
  "options_ui": {
    "chrome_style": true,
    "page": "src/options.html"
  },
  "background": {
    "scripts": [
      "src/js/back.js",
      "src/js/control.js"
    ],
    "persistent": false
  },
  "permissions": [
    "tabs",
    "activeTab",
    "storage",
    "notifications",
    "contextMenus"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{3ac87591-689b-4e2c-8fdf-95bc00956ab2}"
    }
  }
}