Examine source code of URL Copy Helper

{
  "manifest_version": 2,
  "name": "URL Copy Helper",
  "description": "Copy current URL and Title. Rich Text is avalable!",
  "version": "1.0.4",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "tabs",
    "contextMenus",
    "activeTab",
    "scripting"
  ],
  "commands": {
    "Markdown": {
      "description": "Copy in Markdown format"
    },
    "HTML": {
      "description": "Copy in HTML format"
    },
    "URL": {
      "description": "Copy in URL format"
    },
    "Title": {
      "description": "Copy in Title format"
    },
    "WikiLink": {
      "description": "Copy in WikiLink format"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "url-copy-helper@eetann"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "URL Copy Helper",
    "default_popup": "popup.html"
  }
}