Examine source code of Zend Debugger Toolbar

{
  "description": "Provides integration with Zend debugging and profiling tools.",
  "manifest_version": 2,
  "name": "Zend Debugger Toolbar",
  "version": "4.0.2resigned1",
  "author": "Rogue Wave Software",
  "homepage_url": "https://github.com/zendtech/zend-debugger-toolbar",
  "icons": {
    "16": "icons/zde_icon16.png",
    "32": "icons/zde_icon32.png",
    "48": "icons/zde_icon48.png",
    "64": "icons/zde_icon64.png"
  },
  "applications": {
    "gecko": {
      "id": "{714BDBD0-7E3A-11E6-86F1-66A48202D2A8}"
    }
  },
  "permissions": [
    "activeTab",
    "tabs",
    "storage",
    "cookies",
    "webRequest",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "browser-polyfill.min.js",
      "common.js",
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/debugmenu.png",
    "default_title": "Debug with Zend Debugger",
    "default_popup": "menu.html"
  },
  "options_ui": {
    "page": "settings.html"
  }
}