User Agent: Mozilla/5.0 (Windows NT 5.1; rv:18.0) Gecko/18.0 Firefox/18.0 Build ID: 20121012114555 Steps to reproduce: My Aurora 17 has been updated to version 18 (2012-10-08 win32 en-US, 2012-10-12 win32 en-US, then 2012-10-12 win323 hu). Actual results: The Firefox button menu covers opening Web developers submenu. The same happens in bookmarks menu, it covers bookmarks submenus. Expected results: Web developers submenu should be drawn over the Firefox button menu.

Can you reproduce this with your add-ons disabled?

I disabled all my add-ons manually. It didn't help. I created new profile but nothing changed. If I restart the browser in safe mode, it's OK, the bug disappears.

Regression range hunting: m-i First Bad:http://hg.mozilla.org/integration/mozilla-inbound/rev/7c119b50e7aa Last OK :http://hg.mozilla.org/integration/mozilla-inbound/rev/65b95ed309b9 So, caused by Bug 793065 or Bug 610713. (Likely Bug 610713)

And as a note, problem happens only when hardware acceleration in enabled.

Are the people affected all running Windows XP? If so, did anyone with this bug on XP experience bug 610713 at all?

Interestingly, as far as I test, I can't reproduce bug 610713 at all with m-i changeset http://hg.mozilla.org/integration/mozilla-inbound/rev/65b95ed309b9 (Last changeset before the patches of bug 610713 was landed)

I don't have access to an XP computer that supports hardware acceleration so I can't test this properly. Assuming bug 610713 didn't affect XP users adding an OS check could fix this bug without regressing that one.

Comment on attachment 671266 [details] [diff] [review] Possible patch Review of attachment 671266 [details] [diff] [review]: ----------------------------------------------------------------- Looks good to me. I guess we're working around a Windows XP bug here.

Comment on attachment 671266 [details] [diff] [review] Possible patch Review of attachment 671266 [details] [diff] [review]: ----------------------------------------------------------------- I think we should take this on trunk ASAP because we need to see if it fixes the problem. The patch itself is quite safe, it's just a partial backout of bug 610713 for Windows XP.

Pushed to try: https://tbpl.mozilla.org/?tree=Try&rev=752e89fd3a50

No problem with try server build on my PC.

Comment on attachment 671266 [details] [diff] [review] Possible patch https://hg.mozilla.org/integration/mozilla-inbound/rev/69e943a96a42

Comment on attachment 671266 [details] [diff] [review] Possible patch [Approval Request Comment] Bug caused by (feature/regressing bug #): 610713 User impact if declined: menus in the wrong z-order make the browser difficult to use Testing completed (on m-c, etc.): landed on m-c Risk to taking this patch (and alternatives if risky): low risk. It's effectively a partial backout of bug 610713 for Windows XP only String or UUID changes made by this patch: none

Thanks for the quick followup work, James.

WFM in the Oct 18 build of Seamonkey, WinXP. thank you!

Comment on attachment 671266 [details] [diff] [review] Possible patch Approving for aurora, considering it is low risk and user verification in comment 18 .

Verified as fixed on Firefox 18 beta 3 - web developer and bookmarks menus are not covered anymore. Mozilla/5.0 (Windows NT 5.1; rv:18.0) Gecko/20100101 Firefox/18.0 Build ID: 20121205060959