Examine source code of MarkDownload - Markdown Web Clipper

{
  "manifest_version": 2,
  "name": "MarkDownload - Markdown Web Clipper",
  "version": "3.2.0",
  "author": "Gordon Pedsersen",
  "description": "This extension works like a web clipper, but it downloads articles in markdown format.",
  "icons": {
    "16": "icons/favicon-16x16.png",
    "32": "icons/favicon-32x32.png",
    "48": "icons/favicon-48x48.png",
    "128": "icons/appicon-128x128.png",
    "192": "icons/favicon-192x192.png",
    "512": "icons/favicon-512x512.png"
  },
  "permissions": [
    "<all_urls>",
    "activeTab",
    "downloads",
    "storage",
    "contextMenus",
    "clipboardWrite"
  ],
  "browser_action": {
    "default_title": "MarkDownload",
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/favicon-16x16.png",
      "32": "icons/favicon-32x32.png",
      "48": "icons/favicon-48x48.png",
      "128": "icons/appicon-128x128.png"
    }
  },
  "background": {
    "scripts": [
      "browser-polyfill.min.js",
      "background/apache-mime-types.js",
      "background/moment.min.js",
      "background/turndown.js",
      "background/turndown-plugin-gfm.js",
      "/background/Readability.js",
      "shared/context-menus.js",
      "shared/default-options.js",
      "background/background.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html",
    "browser_style": false,
    "chrome_style": false,
    "open_in_tab": false
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+Shift+M"
      }
    },
    "download_tab_as_markdown": {
      "suggested_key": {
        "default": "Alt+Shift+D"
      },
      "description": "Save current tab as Markdown"
    },
    "copy_tab_as_markdown": {
      "suggested_key": {
        "default": "Alt+Shift+C"
      },
      "description": "Copy current tab as Markdown to the clipboard"
    },
    "copy_selection_as_markdown": {
      "description": "Copy current selection as Markdown to the clipboard"
    },
    "copy_tab_as_markdown_link": {
      "suggested_key": {
        "default": "Alt+Shift+L"
      },
      "description": "Copy current tab URL as Markdown link to the clipboard"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1c5e4c6f-5530-49a3-b216-31ce7d744db0}",
      "strict_min_version": "65.0"
    }
  }
}