Some people have a strange way of thanking Piro for updating the addon in time for Quantum and allowing users a transition as smooth as possible. He even found the time to document all the things that just aren't possible yet with the new webextension API, like hiding the original tab bar. With a quick look at the extension's github pages you also find solutions for that (hint: you have to place some lines in userChrome.css as this is the only way Firefox left to modify the GUI). I'm sure Piro will re-add all these missing features as soon as Firefox development will allow it.

So, from my point of view: this extension is still great and really adding value to the browser. I can live with some glitches and missing features as long as I don't have to cope with the standard tab bar. Instead of whining about things missing, what about contributing some userChrome.css snippets to relevant issues in the bug tracker (you people did report problems there before leaving one-star reviews here, did you?) so that others can participate?

BTW: Is it just me or doesn't a donate button exist? I would love to spare a few dimes for motivation.