Ok so have used the kde screen edge thingy once for Firefox with another application, but now every time that i launch Firefox it uses the half window option and have to maximise it every time. Is there any way to tell KDE that I wish to use maximised screen every time that Firefox launches. Have tried putting Firefox window to middle so screen edge would maximise window, then close Firefox that it would save that setting, but not listening. Does it maybe have something to do with Kwin?
AFAIK, KDE should remember the way you’ve closed it and open it the same way.
Anyway, you can configure the window behaviour for Firefox by starting firefox and clicking on the icon.
Advanced->Special Applications Settings, there you’ll find a lot of things you can override.
Best of luck!
Thanks for the tip, that worked