Examine source code of LiveChat Extension

{
  "manifest_version": 2,
  "name": "LiveChat Extension",
  "description": "Webextension for LiveChat",
  "version": "0.4.0",
  "homepage_url": "https://www.estos.de",
  "icons": {
    "48": "icons/livechat-48.png",
    "96": "icons/livechat-96.png",
    "128": "icons/logo-128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "tabs",
    "declarativeContent",
    "webNavigation",
    "https://*/",
    "idle"
  ],
  "page_action": {
    "browser_style": true,
    "default_icon": {
      "19": "icons/livechat-pageicon-19.png",
      "38": "icons/livechat-pageicon-38.png",
      "48": "icons/livechat-pageicon-48.png"
    },
    "default_title": "LiveChat",
    "default_popup": "popup.html"
  }
}