F11 a couple of times should resize the firefox window or alternatively move the taskbar/panels out of the way, off to the sides and then resize the windows with the mouse. Once you've set them to the right size for you then go to
Edit - Preferences - Content - Enable JavaScript Advanced ...
and then UNtick the top (?) option which is "Move or resize window". This should prevent javascript from being able to resize your window inconviently
Good luck and regards from Tom :)
F11 a couple of times should resize the firefox window or alternatively move the taskbar/panels out of the way, off to the sides and then resize the windows with the mouse. Once you've set them to the right size for you then go to
Edit - Preferences - Content - Enable JavaScript Advanced ...
and then UNtick the top (?) option which is "Move or resize window". This should prevent javascript from being able to resize your window inconviently
Good luck and regards from
Tom :)