Open firefox.
F11 x 2
UN-MAXIMIZE (If Maximized)
Reduce size of firefox window to fit inside of desktop.
File -> Quit
Open firefox.
Maximize
File -> Quit
Open firefox.
It should now be sized to the desktop correctly.
This implies that there is a bug, related to requested window size and condition, as saved by firefox.
I think I found a way to "undo" this behavior.
Open firefox.
F11 x 2
UN-MAXIMIZE (If Maximized)
Reduce size of firefox window to fit inside of desktop.
File -> Quit
Open firefox.
Maximize
File -> Quit
Open firefox.
It should now be sized to the desktop correctly.
This implies that there is a bug, related to requested window size and condition, as saved by firefox.