I have been using this addon for years and didn't even update to the new Firefox (was on 57) just cause this addon was missing. I would've given it 10/5 every time.
Until for some genius reason, they added addon update here which has no useful functionallity from older ones (you know, X button to close tabs, Close All Similar Tabs, Open New Tab next to the current one.. among others). There isn't even an options for Tab Mix Plus. WTF was the point of adding this update and ruining the current installation for everyone?
Now I even updated to the new Firefox, thinking that maybe the older version is the reason why I can't see functionality of the newer TMP update. Nope, it's the same. No option, all those features that made it useful, missing. And having updated my Firefox, I can't be arsed with going back cause it removed older addons for me, which worked on previous version of FF.
I'll change the rating if this addon actually becomes useful. Right now it's just a waste of space.
EDIT: Also, apparently the newer version is "Web Extension" version. So why was this updated to do nothing?
EDIT 2: Updated ratings back to 5/5 since I went back to old version eventually and now updated to Quantum so meh!