Build Identifier: http://hg.mozilla.org/mozilla-central/rev/d71dab82fff4 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:13.0a1) Gecko/20120211 Firefox/13.0a1 ID:20120211031145 This is similar Bug 705174 but different regression range. Scrolling performance is extremely sluggish on ftp.mozilla.org/pub/addons/ if mouse pointer is in row. Reproducible: Always Steps to Reproduce#1: 1. Start Firefox with new profile 2. Open ftp://ftp.mozilla.org/pub/addons/ 3. Wait for page load (throbber stops animating and favicon appears) 4. Pot mouse pointer on list. 5. Scroll down And also mouse hover styles that apply outline is lagged. Reproducible: Always Steps to Reproduce#1: 1. Start Firefox with new profile 2. Open ftp://ftp.mozilla.org/pub/addons/ 3. Wait for page load (throbber stops animating and favicon appears) 4. Pot mouse pointer on row. 5. Move mouse pointer upward and downward Regression window(m-c) Works: http://hg.mozilla.org/mozilla-central/rev/2b61af9d18ee Mozilla/5.0 (Windows NT 6.1; WOW64; rv:13.0a1) Gecko/20120207 Firefox/13.0a1 ID:20120207023403 Fails: http://hg.mozilla.org/mozilla-central/rev/8f1b1574e4b0 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:13.0a1) Gecko/20120207 Firefox/13.0a1 ID:20120207035004 Pushlog: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=2b61af9d18ee&tochange=8f1b1574e4b0 Suspected: Bug 724432

This is the expected result of backing out one of the things that fixed the original bug. This will be fixed again when that lands again.

Although the fact that bug 675015 doesn't do much makes me think we should consider increasing the timer from that patch from 100 ms to something higher. It's a balancing act though as we don't want it to feel weird when we update hover after scrolling is over.

The site is gone