Extension Monarch is a free Chrome extension that helps to protect yourself from extension conflicts and provides a quick and intuitive interface to manage them. It's a handy tool for developers who make multiple browser instances or use third-party browser versions.

The extension allows you to keep your browser and desktop on the same page and to use multiple windows, tabs, or even Chrome apps. You can also use the window controls or the Chrome Menu icon to switch to another instance.

There are different ways of preventing conflicts and ensuring that your browser is not syncing with the wrong settings. The extension will make sure that your browser doesn't save settings that will cause conflicts. This feature can be turned off by unchecking the “Save on startup” checkbox on the settings page.

The extension supports Google Chrome version 45 and above, but can be compatible with earlier versions as well.