"need to reset thread root key" warning (from mozilla/firefox?)

[legalois]

During recent sessions with the Mozilla/Firefox port (v.1.0.6_1,1), I 
get _numerous_ copies of this warning:
"need to reset thread root key"
Questions about this message that I can't answer...
What app. is complaining--Firefox? WindowMaker? XFree86? or FreeBSD?
Does it mean that some app. or the o.s. need(ed) to reset, etc., and did 
it, and everything is fine; OR
Do I as user "need to reset," etc.,? If so, where to begin?
- Jake