Just to doublecheck did you disable hardware acceleration in Firefox or in Flash? Upgrade your graphics drivers to use hardware acceleration and WebGL

I also understand it is still crashing in Safe Mode, can you please copy the last 5 crash reports from about:crashes that have bp- in front of them. This will help further investigate the crash signature associated with the crashes you are seeing.

Thank you.

Hello,

Thank you for your response. I disabled hardware acceleration in Flash, not Firefox. However, I tried to load a video again today and, though I've done nothing since then, now it's working, so I have no idea what changed but I'm glad.

I did go ahead and check for crash reports but none are listed which I suspect may be related to me running Firefox within Sandboxie (I perform all updates outside of the sandbox, of course), so it's possible that the last time I restarted Firefox it cleared the sandbox and whatever it was that was causing the problem was taken care of, although I had restarted Firefox and deleted the sandbox contents several times before posting this topic.

I don't know, but thank you regardless, I'm just glad it's working again.