Examine source code of Quizzard Pro

{
  "manifest_version": 2,
  "name": "Quizzard",
  "version": "4.4.1",
  "version_name": "4.4.1",
  "description": "Quick and easy tool to rapidly search for homework questions, definitions and quiz answers.",
  "homepage_url": "https://www.quizzardapp.com/home",
  "icons": {
    "16": "icons/icon_16.png",
    "48": "icons/icon_48.png",
    "96": "icons/icon_96.png",
    "128": "icons/icon_128.png",
    "256": "icons/icon_256.png"
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "Quizzard",
    "default_icon": "icon.png"
  },
  "background": {
    "scripts": [
      "./assets/background.js"
    ]
  },
  "permissions": [
    "storage",
    "contextMenus",
    "https://www.google.com/*",
    "https://quizlet.com/*",
    "https://www.quizzardapp.com/*",
    "https://analytics.quizzardapp.com/*",
    "https://cache.quizzardapp.com/*"
  ],
  "web_accessible_resources": [
    "img/*.svg",
    "img/*.png"
  ],
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+Shift+P",
        "mac": "MacCtrl+Command+P"
      }
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d8f5d575-f66d-4733-8b24-32f4bbb7fd72}"
    }
  }
}