Created attachment 414944 [details] stack trace Loading layout/base/crashtests/378325-1.html (with focus) triggers: ###!!! ASSERTION: cannot get ptop: 'ptop', file /Users/jruderman/central/dom/base/nsGlobalWindow.cpp, line 6689 ptop is null because top is null.
This run didn't cause this assertion at all: http://tinderbox.mozilla.org/showlog.cgi?log=Firefox/1276548822.1276549542.31065.gz
Likewise, neither did this run: s: win32-slave17 2010-06-23 11:50a PDT, debug crashtest: http://tinderbox.mozilla.org/showlog.cgi?log=Firefox/1277316072.1277317760.16451.gz#err0
This assertion is failing sporadically in a new crashtest that was checked in today. I filed bug 844525 for that.
Also, for reference, the crashtest from comment 0 here is currently marked as "asserts(0-99)": https://mxr.mozilla.org/mozilla-central/source/layout/base/crashtests/crashtests.list#148
Testcase no longer asserts on trunk.
removing the b2g 2.5 flag since this commit has been reverted due to an incorrect merge, sorry for the confusion