"Confetti" appears in Firefox, animates with mouse movement over links. What's the problem?

There are bits of "confetti" that appear all over the Firefox window and change positions/color/shape whenever something on the window changes or is animated (mousing over links, allowing a cursor to blink, active video in the window.) Colors vary from blues, brown, purple, pink, and reds.
I've noticed that this problem does not replicate in other web browsers (others being IE and Chrome). I have uninstalled and reinstalled Firefox, but that does not appear to solve the problem.
This problem only occurred after watching "The Daily Show" today and has been persistent since, even on other websites with video. (Sorry John Oliver, I wish it was something else.) However, there are no "confetti" effects if I activate the video to full screen.
Any ideas?
Thanks.

Weird display artifacts immediately make me think of possible graphic driver incompatibilities. Not sure why results would differ between embedded Flash and full screen, but... I suggest disabling hardware graphics acceleration in Firefox and, if that doesn't help, in Flash.
(A) In Firefox, un-check the box here and restart:
orange Firefox button (or Tools menu) > Options > Advanced > General > "Use hardware acceleration when available"
(B) In Flash, see this support article from Adobe: http://helpx.adobe.com/flash-player/kb/video-playback-issues.html#main_Solve_video_playback_issues
Any improvement?

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