Created attachment 8681597 [details] stack trace When I open a file dialog e.g. for choosing the download location Firefox crashes with an NSInvalidArgumentException. This happens since the update to Mac OS X 10.11. (The same error appears in Thunderird as well.)
Works for me with Nightly 45.0a1 (2015-10-31).
I don't see any mozilla code in these stacks. Can't reproduce either.