Examine source code of Karotter Studio

{
  "manifest_version": 3,
  "name": "Karotter Studio",
  "version": "1.8.0",
  "description": "Karotterをより快適に。より柔軟にカスタマイズ。",
  "author": "NamiCode",
  "browser_specific_settings": {
    "gecko": {
      "id": "karotter-studio@nami-code.dev",
      "strict_min_version": "109.0"
    }
  },
  "permissions": [
    "storage",
    "unlimitedStorage",
    "downloads",
    "declarativeNetRequest"
  ],
  "host_permissions": [
    "<all_urls>",
    "https://karotter.com/*",
    "https://*.karotter.com/*",
    "https://karotter.jp/*",
    "https://*.karotter.jp/*",
    "https://karotter.karon.jp/*",
    "https://*.karotter.karon.jp/*",
    "https://apikarotter.karon.jp/*",
    "https://*.apikarotter.karon.jp/*"
  ],
  "icons": {
    "16": "logo/icon16.png",
    "32": "logo/icon32.png",
    "48": "logo/icon48.png",
    "128": "logo/icon128.png"
  },
  "action": {
    "default_icon": {
      "16": "logo/icon16.png",
      "32": "logo/icon32.png",
      "48": "logo/icon48.png",
      "128": "logo/icon128.png"
    },
    "default_title": "Karotter Studio",
    "default_popup": "popup.html"
  },
  "sidebar_action": {
    "default_icon": "logo/icon32.png",
    "default_title": "Karotter Studio",
    "default_panel": "popup.html",
    "open_at_install": false
  },
  "background": {
    "scripts": [
      "theme-engine.js",
      "storage.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://karotter.com/*",
        "https://*.karotter.com/*",
        "https://karotter.jp/*",
        "https://*.karotter.jp/*",
        "https://karotter.karon.jp/*",
        "https://*.karotter.karon.jp/*",
        "https://apikarotter.karon.jp/*",
        "https://*.apikarotter.karon.jp/*"
      ],
      "js": [
        "theme-engine.js",
        "storage.js",
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "font/*.otf",
        "font/*.ttf"
      ],
      "matches": [
        "https://karotter.com/*",
        "https://*.karotter.com/*",
        "https://karotter.jp/*",
        "https://*.karotter.jp/*",
        "https://karotter.karon.jp/*",
        "https://*.karotter.karon.jp/*",
        "https://apikarotter.karon.jp/*",
        "https://*.apikarotter.karon.jp/*"
      ]
    }
  ]
}