Examine source code of Shan Dictionary

{
  "manifest_version": 2,
  "name": "Shan Dictionary",
  "author": "haohaa tai dev",
  "description": "This addon will provide such as Shan-English, Shan-Burmese, Thai-Shan, Pali-Shan and more dictionary from shandictionary.com",
  "version": "1.2.0",
  "browser_action": {
    "default_popup": "./popup/popup.html",
    "default_title": "Shan Dictionary",
    "default_icon": "assets/images/icon.png"
  },
  "web_accessible_resources": [
    "assets/images/icon.png",
    "assets/css/fontawesome.min.css",
    "assets/css/regular.min.css",
    "assets/css/solid.min.css",
    "assets/fonts/fa-regular-400.woff2",
    "assets/fonts/fa-solid-900.woff2",
    "assets/fonts/Shan.woff"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "main.css",
        "assets/css/fontawesome.min.css",
        "assets/css/regular.min.css",
        "assets/css/solid.min.css"
      ],
      "js": [
        "main.js",
        "text-to-speech.js"
      ],
      "run_at": "document_end",
      "all_frames": true
    }
  ],
  "options_ui": {
    "page": "./options/options.html",
    "browser_style": true
  },
  "permissions": [
    "storage",
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{da6007bb-7f4c-4d53-8386-45c823a435e1}"
    }
  }
}