I have a Macbook Pro 11,1 running OS X El Captian. Recently, whenever in an application such as Firefox my menu bar and dock disappear. This is really annoying, as in system preferences both my dock & menu bar are set to not autohide. If I click the desktop, suddenly the dock and menu bar pop back up.
Any suggestions?
Best Answer
It turns out this is a bug with Firefox. These instructions I found fixed the issue.
src: https://discussions.apple.com/thread/3096551?tstart=0