Here's the corresponding bit for Mozilla: https://bugzilla.mozilla.org/show_bug.cgi?id=633421 https://bugzilla.mozilla.org/show_bug.cgi?id=633421 I definitely

Here's the corresponding bit for Mozilla: https://bugzilla.mozilla.org/show_bug.cgi?id=633421 https://bugzilla.mozilla.org/show_bug.cgi?id=633421 I definitely experienced the same in Chromium. Once upon a time, I also experienced similar timing weirdness on inactive tabs with .gif animations for some version of Chromium (tab out, wait a few seconds, tab back and suddenly the animation is superfast for a few seconds) but I can't reproduce it with modern versions. Update: Here's the Chromium one: http://codereview.chromium.org/6577021 http://codereview.chromium.org/6577021