Rated 5 out of 5 stars
Very good tool, unfortunately doesn't work with TB higher than 52.9.1 (with 52.9.1 it works perfect). There is no alternative for this. minimizetotray-reanimated for example makes it possible to minimze to tray yes, but you still have to do it manually once at startup of windows.
EDIT: Now User morat from mozillazine gave me Version minimize_on_start_and_close_184.108.40.206 it works like charme with v60.4-x64