Examine source code of HTML.MD

{
  "manifest_version": 2,
  "name": "HTML.MD",
  "description": "Convert any web page to Markdown instantly",
  "version": "1.0.1",
  "icons": {
    "16": "/icon/16.png",
    "32": "/icon/32.png",
    "48": "/icon/48.png",
    "128": "/icon/128.png"
  },
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "html.md@gir8.it",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "strict_min_version": "142.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "HTML.MD",
    "default_popup": "popup.html"
  }
}