User Agent: Mozilla/5.0 (X11; Linux i686; rv:27.0) Gecko/20100101 Firefox/27.0 (Beta/Release) Build ID: 20131020030202 Steps to reproduce: As of Nightly 27.0a1 (2013-10-20) and possibly a bit earlier, browser window(s) constantly showing distracting flashing / strobing as (what appear to be) blitting artifacts seem to temporarily "tear" the screen, with regions randomly showing entirely white or black for fractions of a second. Even as I type this it's happening as the characters appear in the text box. Actual results: Allowed Nightly to update itself. Expected results: The flashing and other distracting (seemingly blit-related) artifacts ought not be observable.

I should add that for comparison I just now fired up the Epiphany browser on my Debian system and it's rock solid, smoothly displaying all the same pages with no flashing or blit-type artifacts visible.

A few things: 1. Can you narrow down more precisely (which Nightly build) when the behavior began? 2. Does it happen more often with scrolling or certain websites? 3. Does it happen in the browser chrome, or only in content? Thanks!

According to mozregression the easily reproducible conclusion is: Last good nightly: 2013-10-19 First bad nightly: 2013-10-20 Pushlog: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=e25e62d174ed&tochange=0d316980f21f ...and although I'm not sure I understand the question about "chrome" I will respond by saying that the flashing and other distracting artifacts seem to affect the entire browser window, though I could be wrong since they are so fast.

The flashing seems associated with pretty much any screen update but is most evident with scrolling and with content like animated GIF images. I note that Flash content like Youtube vids seem not to suffer the problem, regardless of whether displayed within a page or in full-screen mode.

The problem seems to be completely independent of the WWW site being viewed and even happens when scrolling the about:config screen...

In the spirit of better-to-provide-too-much-rather-than-too-little info here is the output of the system info scavenger script that's part of the NVIDIA driver installation package. System is running Debian, no recent changes in HW or SW config.

It sounds like bug 928727. Same regression range. If you disagree, please re-open the bug.