I didn't even know there was a group tabs feature. And reading through your guide on how to use it, I'll never use it either. It's no wonder nobody did use it.

A problem I've had with Pale Moon is that it is stuck with an older version of Firefox, meaning some newer extensions don't support it. Also, the user base is so inconsequentially small that most developers won't bother going out of their way to continue development just for Pale Moon users. They'll either stop development completely or drop Firefox support and focus on Webkit/Chrome.