Firefox keyboard shortcuts stop working osx 10.10.3
I have a Macbook Pro recently updated to OSX 10.3.3 using Firefox 37.0.1. When the computer sits idle for some period of time the keyboard shortcuts (i.e. Cmd+W, Cmd+Q, Cmd+T) stop responding. This didn't start until after the recent OSX update. Anyone else notice this? Suggestions? Thanks
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Also, if I use the drop down menus to quit Firefox and restart all of the shortcut keys work.