Rated 1 out of 5 stars

I'll give the developer the benefit of the doubt and assume some catastrophic mistake made him publish this update by mistake, but that doesn't change the fact that it's left me scrambling for the links I needed for work which I had neatly stored in sessions. Is there even any functionality left? The extensions page marks it as enabled, but I don't see any difference.

This add-on was a big part of the reason why migrated from Firefox to Waterfox. It's frankly infuriating how vulnerable we all are as users.

The update from yesterday was a mistake.
You can reinstall the latest version 0.5.04 from https://addons.mozilla.org/en-US/firefox/addon/tab-mix-plus.
The latest beta is here: https://bitbucket.org/onemen/tabmixplus/downloads/tab_mix_plus-0.5.0.5pre.180526a1.xpi
I am currently working on Tab mix WebExtension, but it will take some time to rewrite all the code.