Sometimes for unknown circumstances to me, some applications (like Firefox) lose the minimize button.
What might the cause be?
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I am not sure myself but a quick Google search reveals some interesting theories:
For some reason the OS seems to get disconnected from the Dock and disables the minimization. I haven't found a cause yet but I usually find that opening /Applications/Utilities/Terminal.app and running: Code:
killall -HUP Dock
fixes it. The only downside is that all windows which are currently having issues will not suddenly start working but all new windows will behave properly.