Examine source code of Claude Themes

{
  "manifest_version": 3,
  "name": "Claude Themes",
  "version": "1.1.0",
  "description": "A growing catalog of themes for claude.ai. Bind a theme per project so tabs are distinguishable at a glance. Amber / Green / White / CGA / CRT / Synthwave / Vanilla.",
  "host_permissions": [
    "https://claude.ai/*"
  ],
  "permissions": [
    "storage",
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://claude.ai/*"
      ],
      "css": [
        "content.css",
        "variants/amber.css",
        "variants/green.css",
        "variants/white.css",
        "variants/cga.css",
        "variants/crt.css",
        "variants/synthwave.css"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start",
      "all_frames": false
    }
  ],
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_title": "Claude Themes",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "web_accessible_resources": [
    {
      "resources": [
        "fonts/*"
      ],
      "matches": [
        "https://claude.ai/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "claude-themes@local",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}