5 stars simply for continuing the development. I sent you 15 $ for support because this is one of the MOST important add-ons for Firefox (besides security add-ons).
I also voted for all the bugs indirectly mentioned here: http://tabmixplus.org/support/troubleshooting/data/legacy-tabmix.html - however, one question, you also link to a list of many many bugs (https://mzl.la/2DihlMG). Is it necessary to vote for all these as well? One has to jump through a lot of hoops in order to vote (even more in case of multible bugs).
Regards.