Examine source code of Tinkerfont

{
  "manifest_version": 3,
  "name": "Tinkerfont",
  "version": "1.1.0",
  "description": "The fastest way to inspect, replace, and test new fonts on live websites.",
  "browser_specific_settings": {
    "gecko": {
      "id": "tinkerfont@m64.in",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "activeTab",
    "scripting",
    "contextMenus"
  ],
  "optional_permissions": [
    "clipboardWrite"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_title": "Tinkerfont",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "background": {
    "scripts": [
      "browser-shim.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "font-inspect.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "storage.js",
        "bunny-font-loader.js",
        "content.js"
      ],
      "run_at": "document_idle",
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "panel.html",
        "panel.css",
        "popup.js",
        "storage.js",
        "bunny-catalog.js",
        "dark.svg",
        "white.svg"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  }
}