What's unusable about the new tree style tabs? I use it constantly.
If you want old greasemonkey scripts to work without changes, use violentmonkey.
There must be a bug with the new greasemonkey that I can't find the editor either. Use violentmonkey for that too for now.
I'll grant that the new responsiveness of FF makes TST feel much better. But there's one thing that's constantly giving me headaches. I don't feel like the highlighting given to the currently-selected tab is in-your-face enough, so that I'm always scanning up and down the tree trying to see which one it is. The other formatting options it used have were nice, but being able to at least make the selected tab's title bold was a big deal for me.
I realize that this is technically possible in the new regime via userChrome.css. However, the element classes are completely undocumented so I have no idea how to accomplish it.
Before FF57, I was able to set the font and background color for tabs depending on their status (current, inactive, unread, etc.), and that's what I want now. IIRC, this was actually a feature of Tab Mix Plus.
It's clear that this is still possible even without TMP, but requires putting code in userChrome.css. That would be fine with me, if I could just find any documentation on what element classes (or whatever would be the most appropriate selectors) I need to reference.
document.querySelector('#sidebar')._contentWindow[0].document.querySelectorAll('.tab.active')[1] https://github.com/piroor/treestyletab/wiki/Code-snippets-fo...
With tree style tabs I didn't realize there is a CSS hack to remove the top tabs.