Examine source code of Summarize On Select

{
  "manifest_version": 3,
  "name": "Summarize On Select",
  "version": "2.1.0",
  "description": "Select text and summarize it with any AI model (OpenAI, Claude, Gemini, DeepSeek, Qwen, Grok, Mistral, OpenRouter) in an in-page overlay.",
  "browser_specific_settings": {
    "gecko": {
      "id": "admin@belagum.ru",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "activeTab",
    "scripting",
    "tabs",
    "contextMenus"
  ],
  "optional_host_permissions": [
    "https://api.openai.com/*",
    "https://api.anthropic.com/*",
    "https://generativelanguage.googleapis.com/*",
    "https://api.deepseek.com/*",
    "https://dashscope-intl.aliyuncs.com/*",
    "https://api.x.ai/*",
    "https://api.mistral.ai/*",
    "https://openrouter.ai/*",
    "https://*/*",
    "http://localhost/*",
    "http://127.0.0.1/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "action": {
    "default_title": "Summarize On Select",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "commands": {
    "summarize-selection": {
      "suggested_key": {
        "default": "Alt+N"
      },
      "description": "Summarize current selection"
    }
  }
}