Great, but now broken Rated 5 out of 5 stars

This is an absolute awesome add-on. I now can not live without tab groups, they make my work so much easier being able to sort and catagorize work I am on, and I am able to shelve my work at the end of the day to come back and deal with it tomorrow. Just great.However the most recent upgrade of Firefox has broken it and you can't access all the groups I have hibernated. I had to uninstall Firefox and install an older version (you can get version 19 here: https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/19.0/win32/en-GB/). I do have my groups back and can get back to work now, but it would be better if this issue was fixed so I can get back to the most recent version of Firefox.