Firefox won't open after sleep mode on mac

I have a mac mini 10.9.5 and because I use it so often, I usually put it to sleep rather than shut it off. When I wake the computer and try to open Firefox from my dock, the page won't load - or it loads a blank page. I have to wait a couple of minutes or so until the "Icon wheel" stops spinning, then close it and reopen it. It works the second time, every time however. If I try to close it while the "icon wheel" is still spinning and reopen it it just does the same thing (won't open again) which just prolongs the frustration. So I HAVE to wait for the wheel to stop and then retry it every time. If a blank page comes up and I try to go to my GMail, then that page won't load until I reopen Firefox. Very frustrating! Any ideas? BTW I am not great with computers so I would appreciate very detailed instructions.
I came to the conclusion that a computer is like a person maybe. And that when you wake it up it takes a few minutes for it to get alert again.... Is that the case?

One of the old work arounds for this was to minimize the browser before putting computer to sleep.
However you might also benefit from trying to browse in safe mode to see if its an acceleration or add on issue. Let it go to sleep and does it still happen?
*[[Troubleshoot Firefox issues using Safe Mode]]

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