Hmm. First, I'm assuming you're using Windows XP and Outlook to read mail -- did you tell Windows that Firefox is your default browser? (This is an option at install.) If not, it could be getting confused. Also, can you open other links from mail (i.e., if someone sends you a YouTube link or something)? If it's ONLY LJ links, then we have an odd problem. If it's ALL links, then I'm sure it's easily fixable.

If that's not the problem, then I'll have to ask Ben (my husband). He probably knows.