Examine source code of Keybr CC Extension

{
  "manifest_version": 3,
  "name": "Keybr CC Extension",
  "short_name": "Keybr CC Ext",
  "description": "An unofficial browser extension for showing layout of CharaChorder 3D input devices on Keybr",
  "version": "8.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "@keybr-cc-extension-new.andy23512",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "action": {
    "default_title": "Open Options"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "background": {
    "service_worker": "js/background.js",
    "scripts": [
      "js/background.js"
    ]
  },
  "icons": {
    "16": "image/icon-16.png",
    "128": "image/icon-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.keybr.com/*"
      ],
      "js": [
        "js/vendor.js",
        "js/content_script.js"
      ],
      "css": [
        "font.css",
        "inject.css"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "matches": [
        "https://www.keybr.com/*"
      ],
      "resources": [
        "*.woff2"
      ]
    }
  ],
  "permissions": [
    "storage"
  ],
  "author": "Tangent Chang (andy23512)",
  "developer": {
    "name": "Tangent Chang (andy23512)",
    "url": "https://gitlab.com/andy23512/keybr-cc-extension"
  },
  "homepage_url": "https://gitlab.com/andy23512/keybr-cc-extension"
}