Examine source code of PageMarkdown - Markdown Web Clipper

{
  "manifest_version": 3,
  "name": "__MSG_extName__",
  "version": "1.1.3",
  "default_locale": "en",
  "description": "__MSG_extDescription__",
  "permissions": [
    "activeTab",
    "downloads",
    "storage",
    "clipboardWrite",
    "scripting",
    "contextMenus"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_title": "__MSG_extShortName__",
    "default_popup": "entrypoints/popup/popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "background": {
    "scripts": [
      "entrypoints/background/service-worker.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "entrypoints/content/content-script.js"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "http://*/*",
        "https://*/*",
        "ftp://*/*",
        "file:///*"
      ],
      "include_globs": [
        "*.md",
        "*.mdown",
        "*.markdown"
      ],
      "css": [
        "entrypoints/viewer/viewer.css"
      ],
      "js": [
        "entrypoints/viewer/viewer.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "options_ui": {
    "page": "entrypoints/options/options.html",
    "open_in_tab": true
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+E"
      }
    },
    "download_tab_as_markdown": {
      "description": "Download tab as Markdown"
    },
    "export_tab_as_pdf": {
      "description": "Export tab as PDF"
    },
    "save_tab_as_mhtml": {
      "description": "Save tab as MHTML"
    },
    "print_tab": {
      "description": "Print current page"
    },
    "cancel_batch": {
      "suggested_key": {
        "default": "Ctrl+Shift+Z"
      },
      "description": "Cancel active batch export"
    }
  },
  "web_accessible_resources": [
    {
      "resources": [
        "entrypoints/content/page-context.js",
        "icons/icon-32.png",
        "_locales/*/messages.json"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "pagemarkdown@pagemarkdown.app",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}