User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0.1) Gecko/20100101 Firefox/4.0.1 Build Identifier: Firefox 4.0.1 When page is zoom-in or zoom-out, sometimes between elements there are invisible 1 pixel wide gaps. See test page. Reproducible: Always Steps to Reproduce: 1.open test page 2.hit Ctrl-+ 3.slowly drag mouse above red line few times 4.background color was changed 5.if background color was not changed, repeat from step 2 Expected Results: Color never should change. I don't see this bug in FF 3.6, Chrome and Opera.
WFM against Mozilla/5.0 (Windows NT 5.1; rv:7.0a1) Gecko/20110610 Firefox/7.0a1 ID:20110610030736 & Mozilla/5.0 (Windows NT 5.1; rv:2.0.1) Gecko/20100101 Firefox/4.0.1 ID:20110413222027. Is your Issue reproducible when you disable the Hardware Acceleration under Options/Advanced/General and restart Firefox?
(In reply to comment #2) > Is your Issue reproducible when you disable the Hardware Acceleration under > Options/Advanced/General and restart Firefox? Yes.
roc fixed this recently, iirc...
Build: Mozilla/5.0 (Windows NT 6.1; rv:7.0a1) Gecko/20110620 Firefox/7.0a1 The issue is not reproducible anymore on the latest Firefox Nightly, after the fix in bug 646757. Setting status to resolved. If you can still see the issue, feel free to reopen the bug. Thanks
Thanks for verifying, AndreiD. Since we know what fixed it, FIXED is the appropriate resolution.