Examine source code of MarkItDown Companion

{
  "manifest_version": 3,
  "name": "MarkItDown Companion",
  "version": "2.4.0",
  "description": "Sync markdown files from MarkItDown, track AI token usage, and export chats from Claude, ChatGPT, Gemini, DeepSeek & Grok.",
  "permissions": [
    "storage",
    "tabs",
    "downloads"
  ],
  "host_permissions": [
    "https://claude.ai/*",
    "https://chatgpt.com/*",
    "https://gemini.google.com/*",
    "https://chat.deepseek.com/*",
    "https://grok.com/*",
    "https://*.googleusercontent.com/*",
    "https://*.gstatic.com/*",
    "https://*.ggpht.com/*",
    "https://*.openai.com/*",
    "https://*.oaidalleapiprodscus.blob.core.windows.net/*",
    "https://*.shutterstock.com/*",
    "https://*.unsplash.com/*",
    "https://*.cloudfront.net/*",
    "https://*.amazonaws.com/*",
    "https://*.anthropic.com/*"
  ],
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "background": {
    "scripts": [
      "background/service-worker.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "markitdown-companion@neosparkx.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://claude.ai/*"
      ],
      "js": [
        "content-scripts/claude-bridge.js"
      ],
      "run_at": "document_start",
      "world": "MAIN"
    },
    {
      "matches": [
        "https://claude.ai/*"
      ],
      "js": [
        "lib/o200k_base.js",
        "lib/token-counter.js",
        "lib/exporter.js",
        "lib/prompts.js",
        "content-scripts/claude.js"
      ],
      "css": [
        "content-scripts/overlay.css"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://chatgpt.com/*"
      ],
      "js": [
        "lib/exporter.js",
        "lib/prompts.js",
        "content-scripts/chatgpt.js"
      ],
      "css": [
        "content-scripts/overlay.css"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://gemini.google.com/*"
      ],
      "js": [
        "lib/token-counter.js",
        "lib/exporter.js",
        "lib/prompts.js",
        "content-scripts/gemini.js"
      ],
      "css": [
        "content-scripts/overlay.css"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://chat.deepseek.com/*"
      ],
      "js": [
        "lib/exporter.js",
        "lib/prompts.js",
        "content-scripts/deepseek.js"
      ],
      "css": [
        "content-scripts/overlay.css"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "https://grok.com/*"
      ],
      "js": [
        "lib/exporter.js",
        "lib/prompts.js",
        "content-scripts/grok.js"
      ],
      "css": [
        "content-scripts/overlay.css"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "http://localhost/*",
        "https://markitdown.neosparkx.com/*"
      ],
      "js": [
        "content-scripts/webapp-bridge.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "icons/*"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  }
}