This bug was filed from the Socorro interface and is report bp-c911a523-e67b-4177-8477-cec4b2110411 . ============================================================= Happened after closing the Options dialog. I was on the "General" page.
More info: You have to be focused on either the OK or Cancel buttons when hitting Escape, to get the crash. I had NVDA 2011.1.1 running (latest official release). I also have a second report: bp-04cb4df3-0652-4726-993a-5fc1e2110411, but the stack for it is the same as the one quoted above, so not really conclusive.
The try-server build for bug 648988 does not fix this bug as was hoped.
This bug is being fixed by bug 648988. I confirmed using latest try-server build from that bug.
per comment #3
Verified fixed by bug 648988 in Mozilla/5.0 (Windows NT 6.1; WOW64; rv:5.0a2) Gecko/20110412 Firefox/5.0a2