Firefox v.s. Windows 10 Multiple Desktops

[Helmanfrow]

I'm a heavy user of the virtual desktop feature in Windows 10.
Whenever I restart Firefox it forgets which window was on which virtual desktop. Every window opens on whichever desktop I'm currently viewing. This is particularly frustrating because I keep a lot of Firefox windows open, and even though I don't restart very often, moving them all to their respective desktops is rather a tedious chore.

I don't know if the issue lies with Windows 10 or Firefox but so far this misbehavior is exclusive to Firefox. Every other browser (Chrome, Brave, Vivaldi) keeps track of its windows with regard to virtual desktops. Not to mention essentially every other piece of software.

Firefox behaves as expected on Windows 11 .

[Etrit]

Have you figured out what is happening?

I'm having the same issue... and whats annoying is that it WAS working fine until a few months ago for me and then suddenly stopped. ......

Well, kinda?   There are still times when windows end up on the right virtual desktops.  I haven't figured out when that is though.

[grguthrie]

Same problem on W11 - just starting now...

Every desktop shows all Firefox windows.

[JibiiKako]

So you are saying that it works better with other Browsers?