User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0
Steps to reproduce:
On Linux (Gnome), Firefox now use client side decoration. Since this is the case, my workflow is broken: in Gnome, I have configured middle mouse on title bars to behave as minimize the window.
It used to work when FF didn't use CSD. It works in other apps.
But with CSD, FF now opens a new tab instead of letting the WM minimize the window.
middle mouse click in title bar always results in opening a new tab
"open a new tab on middle click in title bar" should be an option in about:config (true by default) and let the wm do its job if false