IMAC Yosemite FIREFOX 33.0.2 still getting blank windows after turning off hardware acceleration, they occur in the background and only seen after closing and r

I noticed when my Firefox is minimized that I can not reopen from the Dock on my MAC. So I stop Firefox and reopen, when doing so I get a mixed number of blank windows. After closing these then Firefox behaves as desired until after a bit it all happens again. I read the Windows fix and hoped hardware acceleration would fix it but it does not.

Hello,
Try disabling graphics hardware acceleration. Since this feature was added to Firefox, it has gradually improved, but there still are a few glitches.
'''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Start Firefox in Safe Mode]''' {web link}
While you are in safe mode;
Type '''about:preferences'''<Enter> in the address bar
Select '''Advanced > General.'''
Look for and turn off '''Use Hardware Acceleration'''.
Poke around safe web sites. Are there any problems?
Then restart.

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