When I launch Firefox from my tool bar it comes up as a third size screen on the left had side. I get the little double boxes on the upper right corner "restore down" and when I click that, it shifts the third sized browser to the middle of the screen with the option of "full screen" now available. After clicking that, I finally get the full screen browser. Why is this happening? I can't remember if an update came in for Firefox at that time or not. I have lived with this far to long and don't enjoy the two extra steps it takes to have a full screen. Chrome doesn't do this so I know it is the Firefox (my default browser).