Firefox preferences failing to save

[Eamonn Sullivan]

I just installed FC3T2 yesterday, did a full up2date, and have run
into a minor problem: When I launch Firefox (which is now version
1.0PR), I get the following message: "Failed to save the preferences
file. Any preference changes will be lost at the end of the session."
And, sure 'nuf, they are lost. I've tried running Firefox as root, and
that saves preferences fine. I run into this problem only when running
as a normal user. Any ideas?