Firefox UI is slow when typing or selecting text (after 33.0 update)

After the 33.0 update, I noticed that typing or backspacing in any field on a webpage or even in the Firefox address bar is slow to echo, about a 1 second lag. Also, selecting typed text (to delete it, etc.) by a quick click-drag doesn't select the whole area, yet when I click in the dialog to deselect, the portion that wasn't showing as selected at first, becomes selected for a moment before the whole string selection hilite disappears.
This makes the browser very cumbersome to use.
This appears to be new to 33.0. I tried resetting Firefox, but that didn't fix the problem. No issue in IE 11.0, so I don't think its malware. I also keep all s/w up-to-date, and run avast/zonealarm for security. I've never had a malware infection on this machine. Win7 Home Premium 64-bit, 8GB RAM. Resource utilization is low, so no out-of-control processes.
I did apply the latest Microsoft "Patch Tuesday" updates on 10/15, the same day that I updated Firefox. This may complicate the diagnosis. But again, IE wasn't affected, so how is the Firefox UI different for basic keyboard/display I/O?
If there's an easy way to "downgrade" to the prior 32.0.3 revision, I could try that to confirm. Please help!

Safe mode fixed it, so I then tested disabling all add-ons and plug-ins--no joy. I then disabled hardware acceleration, which fixed it. Re-enabled all add-ons and plug-ins, and still works, so it was the hardware acceleration.
For reference, my system is a Dell desktop with an ATI Radeon HD5670 graphics card, and Dell's latest official driver is the one that shipped with the system in 2010. ATI (AMD) has their latest generic driver for the HD5xxx series dated Sep 2014. Thanks, Dell :-( So, can't really do much about that--glad I'm not a gamer.
Anyway, this still begs the question of what changed in the last 3 days where Firefox went from working just fine with hardware acceleration enabled, to exhibiting this problem.

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