User Agent: Mozilla/5.0 (Windows NT 6.1; rv:15.0) Gecko/20100101 Firefox/15.0 Build ID: 20120824154833 Steps to reproduce: Scroll the scrollbar (see attached document). URL http://tomtomexpert.comxa.com/rw/#la=47.99835540203972&ln=7.5823359489440945&z=5&tb=1-3-57-27-7-9-13-2-29-16&tl=41-6-5-4-44-59-58-54-28-56-55-10-12-11-14-47-8-23-24-15-25-32-48-52-30-31-45-46-17 Actual results: Some elements from the list disappear on scroll start. They reappear about 3 seconds after stopping scrolling. Scrolling is smooth tho. This bug happens on Firefox 15 and 16. Version 14 and older are working fine. Expected results: Scroll without hiding elements.

This bug isn't happening when the border radius is removed from the li elements (tested with firebug on the same page). removed css property: .tab_primlist li { border-radius: 0.5em 0.5em 0.5em 0.5em; }

Regression window(m-c) Good: http://hg.mozilla.org/mozilla-central/rev/2db9df42823d Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/15.0 Firefox/15.0a1 ID:20120504030509 Bad: http://hg.mozilla.org/mozilla-central/rev/e1a40027dc7e Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/15.0 Firefox/15.0a1 ID:20120504014349 Pushlog: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=2db9df42823d&tochange=e1a40027dc7e Regression window(m-i) Good: http://hg.mozilla.org/integration/mozilla-inbound/rev/c608de1b6a53 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/15.0 Firefox/15.0a1 ID:20120502221102 Bad: http://hg.mozilla.org/integration/mozilla-inbound/rev/77bf50b33a05 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/15.0 Firefox/15.0a1 ID:20120502223302 Pushlog: http://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=c608de1b6a53&tochange=77bf50b33a05 Suspected: Bug 716439

Possibly a dup of bug 786817.

Yes, the try server build http://ftp.mozilla.org/pub/mozilla.org/firefox/try-builds/ncameron@mozilla.com-11825cd2645a/try-win32/firefox-18.0a1.en-US.win32.zip fixed this issue.

Thanks for the fix, it's working fine! In which version will it be released? 18 or earlier?

(In reply to kb from comment #5) > Thanks for the fix, it's working fine! In which version will it be released? > 18 or earlier? earlier, exact version TBC :-)

I confirmed this bug and confirmed it is fixed by the patches in 786817, so closing as a dup.