User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:11.0) Gecko/20100101 Firefox/11.0 Build ID: 20120215222917 Actual results: http://mitou.peatix.com/ blinks. Sometimes it become gray.

Browser UR(toolbar)and contents area flash and it become gray when scroll page with HWA on. Contents area flashes and it become gray when scroll page with HWA off. Reproduced on Firefox10.0.2 and Firefox11.0Beta. Reproducible: Always Steps to Reproduce #1: 1. Start Firefox with clen profile 2. Open http://mitou.peatix.com/ 3. Scroll Up and Down Actual Results: Browser UR(toolbar) and Contents area flashes and become gray Expected Results: Should not Regression window(m-c), Cannot reproduce: http://hg.mozilla.org/mozilla-central/rev/e1ae143cc842 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:10.0a1) Gecko/20111026 Firefox/10.0a1 ID:20111026120007 Can reproduce: http://hg.mozilla.org/mozilla-central/rev/16a8d2ab5240 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:10.0a1) Gecko/20111026 Firefox/10.0a1 ID:20111026163203 Pushlog: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=e1ae143cc842&tochange=16a8d2ab5240 Regression window(m-i), Cannot reproduce: http://hg.mozilla.org/integration/mozilla-inbound/rev/d7f3bfc7cd46 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:10.0a1) Gecko/20111025 Firefox/10.0a1 ID:20111025203245 Can reproduce: http://hg.mozilla.org/integration/mozilla-inbound/rev/a2cb1c0671d5 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:10.0a1) Gecko/20111025 Firefox/10.0a1 ID:20111025211543 Pushlog: http://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=d7f3bfc7cd46&tochange=a2cb1c0671d5 Triggered by: a2cb1c0671d5 Robert O'Callahan — Bug 696248. Flush pending onscroll events before painting. r=mats Fixed window(m-c), Can reproduce: http://hg.mozilla.org/mozilla-central/rev/49afabda6701 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:12.0a1) Gecko/20120115 Firefox/12.0a1 ID:20120115033312 Cannot reproduce: http://hg.mozilla.org/mozilla-central/rev/823072af2430 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:12.0a1) Gecko/20120115 Firefox/12.0a1 ID:20120115035713 Fixed pushlog: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=49afabda6701&tochange=823072af2430 Fixed window(m-i), Can reproduce: http://hg.mozilla.org/integration/mozilla-inbound/rev/59cb54c6dfe1 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:12.0a1) Gecko/20120114 Firefox/12.0a1 ID:20120114195007 Cannot reproduce: http://hg.mozilla.org/integration/mozilla-inbound/rev/5e6e63f3aed8 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:12.0a1) Gecko/20120114 Firefox/12.0a1 ID:20120114201408 Fixed pushlog: http://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=59cb54c6dfe1&tochange=5e6e63f3aed8 It seems to be fixed by Bug 598482 - Hook up invalidation flushing to the refresh driver and make all painting asynchronous

Thanks Alice. Since this is fixed in FF12, I think it's probably not worth putting effort into finding a fix for FF11.