Examine source code of Copy as Markdown

{
  "name": "Copy as Markdown",
  "version": "25.6.9",
  "description": "Browser extension to copy hyperlinks, images, and selected text as Markdown",
  "homepage_url": "https://github.com/notlmn/copy-as-markdown",
  "manifest_version": 3,
  "minimum_chrome_version": "88",
  "browser_specific_settings": {
    "gecko": {
      "id": "{6779b4de-d680-462a-8038-43079e365983}",
      "strict_min_version": "106.0"
    }
  },
  "icons": {
    "128": "copy-as-markdown.png"
  },
  "permissions": [
    "contextMenus",
    "activeTab"
  ],
  "action": {
    "default_icon": "copy-as-markdown.png"
  },
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "copy-as-markdown.js"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "copy-as-markdown.js",
        "copy-as-markdown.js.map"
      ],
      "matches": []
    }
  ],
  "commands": {
    "copy-selection-as-md": {
      "suggested_key": {
        "default": "Alt+X",
        "mac": "Alt+X"
      },
      "description": "Copy selection as markdown"
    }
  }
}