Examine source code of Text Assistant

{
  "manifest_version": 2,
  "name": "Text Assistant",
  "version": "0.7",
  "description": "Text Assistant adds an AI writing sidebar and context menu so you can rewrite, summarize, change tone, or reformat highlighted text with your own OpenAI or Claude models on any webpage. Instantly transform your writing with custom prompts, professional tone adjustments, grammar fixes, and more—all while keeping your content private by using your own API keys.",
  "short_name": "Text Assistant",
  "browser_specific_settings": {
    "gecko": {
      "id": "text-assistant@example.com",
      "strict_min_version": "143.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "128": "icons/text-assistant.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "contextMenus",
    "activeTab",
    "storage",
    "https://api.openai.com/*",
    "https://api.anthropic.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle",
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    "icons/text-assistant.png",
    "icons/text-assistant-white.png"
  ]
}