Rated 5 out of 5 stars

per Firefox user 7200ff el des. 15, 2018 ·

ChrissWe comment saved me, this works with the new TB 60. The devs should probably update it or create a "new" add-on for people who need this.

https://github.com/Ximi1970/FireTray/releases

Just download the xpi and install. (save link as, extension manager -> install add-on from file)