Examine source code of Zhongwen: The Popular Chinese Learning Tool

{
  "manifest_version": 2,
  "name": "Zhongwen: The Popular Chinese Learning Tool",
  "short_name": "Zhongwen",
  "version": "5.16.0",
  "author": "Christian Schiller",
  "homepage_url": "https://github.com/cschiller/zhongwen",
  "description": "Official Firefox port of the Zhongwen Chrome extension. Chinese-English dictionary and learning tool.",
  "icons": {
    "16": "images/zhongwen16.png",
    "48": "images/zhongwen48.png",
    "128": "images/zhongwen.png"
  },
  "browser_action": {
    "default_icon": "images/zhongwen48.png",
    "default_title": "Zhongwen Chinese Popup Dictionary"
  },
  "background": {
    "page": "background.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/jquery-3.3.1.min.js",
        "js/zhuyin.js",
        "content.js"
      ],
      "css": [
        "css/content.css"
      ],
      "all_frames": true
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "permissions": [
    "contextMenus",
    "tabs"
  ],
  "commands": {
    "_execute_browser_action": {
      "description": "Enable/Disable Zhongwen"
    }
  },
  "web_accessible_resources": [
    "css/*",
    "js/*",
    "images/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{dedb3663-6f13-4c6c-bf0f-5bd111cb2c79}"
    }
  }
}