start.me does not provide an extension yet for the Maxthon browser yet. But this is something we plan to release in 2017.
How to set start.me as homepage?
Detailed instructions for setting a URL as homepage / new tab page can be found here: https://www.lifewire.com/change-home-page-in-maxthon-4103643
Use https://start.me as URL to load your personal start.me page(s).