Examine source code of HNC

{
  "manifest_version": 2,
  "name": "HN Comments",
  "version": "1.0.0",
  "description": "Hackernews comments management",
  "permissions": [
    "contextMenus",
    "clipboardWrite",
    "tabs",
    "storage",
    "downloads"
  ],
  "icons": {
    "48": "icons/hnc-logo.png",
    "96": "icons/hnc-logo@2x.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://news.ycombinator.com/*",
        "*://*/hn_clipboard.html"
      ],
      "js": [
        "utility.js",
        "hn-comments.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "utility.js",
      "background.js"
    ]
  },
  "commands": {
    "add-selected": {
      "suggested_key": {
        "default": "Shift+Alt+C"
      },
      "description": "Add Selection To HN Clipboard"
    },
    "export-clipboard": {
      "suggested_key": {
        "default": "Shift+Alt+E"
      },
      "description": "Export HN Clipboard to text file"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ec300796-3325-4d3b-83ad-b9f486824d37}"
    }
  }
}