Examine source code of Paste as Markdown

{
  "manifest_version": 2,
  "name": "Paste as Markdown",
  "short_name": "Paste-Mkdown",
  "version": "0.5.7.3",
  "description": "Paste as Markdown.",
  "homepage_url": "http://markitdown.medusis.com",
  "permissions": [
    "activeTab",
    "clipboardRead",
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "lib/lodash.min.js",
      "js/mkutils.js",
      "lib/turndown.js",
      "lib/turndown-plugin-gfm.js",
      "js/html2mk.js",
      "js/browser/background.js"
    ]
  },
  "icons": {
    "16": "icons/paste-mk_16.png",
    "19": "icons/paste-mk_19.png",
    "38": "icons/paste-mk_38.png",
    "48": "icons/paste-mk_48.png",
    "128": "icons/paste-mk_128.png"
  },
  "commands": {
    "paste-mk": {
      "suggested_key": {
        "default": "Alt+C"
      },
      "description": "Paste as Markdown"
    }
  },
  "browser_action": {
    "default_icon": {
      "19": "icons/paste-mk_19.png"
    },
    "default_title": "MarkItDown - Click for help",
    "default_popup": "popup_help.html"
  }
}