firefox and xinerama

[Bob Marcan]

Fedora 33
firefox-88.0.1-1.fc33.x86_64
Window manager is fvwm.

[~]$ xrandr
Screen 0: minimum 320 x 200, current 3520 x 1080, maximum 8192 x 8192
LVDS-1 connected primary 1600x900+0+0 (normal left inverted right x axis y axis) 382mm x 215mm
1600x900 60.01*+ 59.99 59.94 59.95 59.82
...
VGA-1 connected 1920x1080+1600+0 (normal left inverted right x axis y axis) 509mm x 286mm
1920x1080 60.00*+
...

xrandr --output VGA-1 --primary
xrandr
Screen 0: minimum 320 x 200, current 3520 x 1080, maximum 8192 x 8192
LVDS-1 connected 1600x900+0+0 (normal left inverted right x axis y axis) 382mm x 215mm
1600x900 60.01*+ 59.99 59.94 59.95 59.82
...
VGA-1 connected primary 1920x1080+1600+0 (normal left inverted right x axis y axis) 509mm x 286mm
1920x1080 60.00*+
...

palemoon browser stays on screen where is launched.
New window opens on the same screen.

firefox always opens on LVDS-1, even when is launched on VGA-1.
After moving the window to VGA-1, new window again appears on LVDS-1.
No matter if the screen is primary or not.

Any clue?

TIA, Bob


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