Examine source code of Clean copy URL

{
  "name": "Clean copy URL",
  "short_name": "Clean copy",
  "description": "Copy the current URL without extraneous stuff.",
  "homepage_url": "https://github.com/bennypollak/copy_clean_url",
  "version": "1.0.3",
  "background": {
    "scripts": [
      "utils.js",
      "background.js"
    ]
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "permissions": [
    "activeTab",
    "http://*/*",
    "https://*/*"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Clean copy URL",
    "default_icon": "icon128.png"
  },
  "commands": {
    "clean-copy": {
      "description": "clean-copy",
      "suggested_key": {
        "default": "Ctrl+Shift+L"
      }
    },
    "just-copy": {
      "description": "just-copy",
      "suggested_key": {
        "default": "Ctrl+Shift+U"
      }
    },
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+K"
      }
    }
  },
  "manifest_version": 2
}