Did you see this https://news.ycombinator.com/item?id=15342362 ?

I'm in a similar boat waiting for decent alternatives to 'Speed Dial' and 'FireGestures' addons. The existing 'VimFx' replacements like Saka Key are also only partially there in terms of features.

I'm wary of switching to Waterfox because it's a single developer project and might be more buggy than it seems from the outside, but I might end up there after all, if equivalent addons don't rise up.

Tree style tabs work ok on FF57. I expect it to become more polished with time though.

IIRC Hasn't some of them already been ported? (Tree tab and Tree style tab) Maybe you can try the alternatives.