Firefox 9 causing flashes/black boxes?

Ever since i updated to firefox 9 just about 10 minutes ago, my web browsers start to flash and make blocks of black screens randomly on it. Sometimes it fixes itself, other times it just does it nonstop until I close it. Once reopened it's fine but ~10 minutes later the problem comes back. What do i do?

Again, my original post specifically asks what else I can check for in prefs.js. I don't know what to look for. I suspect that something has hung-around somewhere, but don't know what to look for in the prefs file to detect it. No malware or anti-virus software detects anything other than the prefs.js file itself. Safe mode fixes the problem. So obviously something is starting up with FF in normal mode which is causing this, but no clue where/what to look for at this point.

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There is a frequent flashing above my tool bar and sometimes a flashing black box appears over my Yahoo news. How do I make it Stop??b

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In case this is caused by Firefox 33 being incompatible with your graphics card/chipset driver software, could you test for a while in Firefox's Safe Mode? That's a standard diagnostic tool to deactivate extensions, hardware acceleration, and some other advanced features of Firefox. More info: [[Troubleshoot Firefox issues using Safe Mode]].
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Not all add-ons are disabled: Flash and other plugins still run
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(63660)

I just put up a new iWeb website and firefox is putting BIG BLACK BOXES around all my photos. Why has this not been fixed yet? I have to tell everybody who views my site NOT to use Firefox. This is unacceptable. Please fix ASAP. This is my site below.

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Try to uninstall and reinstall Flash
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Thanks, I was remiss in not having already tried safe mode, good shout.
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Hello,
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Firefox 9 causing flashes/black boxes?

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