Examine source code of Markdown Clipboard

{
  "manifest_version": 2,
  "name": "Markdown Clipboard",
  "version": "1.0",
  "description": "Copy text from web pages and format it into Markdown syntax.",
  "permissions": [
    "activeTab",
    "clipboardWrite"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icons/icon.png"
  },
  "icons": {
    "48": "icons/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5b2b4419-dae7-4447-95bd-da5944ddfd43}"
    }
  }
}