If your Firefox interface font somehow become bold after Snow Leopard installed (or its updates, 10.6.2 for example), and you also have bold (or italic) fonts in several sites that is using Helvetica, you need to do this small and easy fix.
Open the Font Book application and make sure you don’t have Firefox active.

Find "lucida" (this is the font in Firefox interface), and delete Lucida Grande (Regular) by right click & click "Reveal in Finder", you will have to enter administrator passwords to delete it. And do not worry, you don’t even have to make a backup, because Mac will recreate this font for system purpose.

Then reopen Firefox, the UI should be back in normal again. Next step is to re-do the above action for Helvetica font or any other font that looks "unusual".
Good luck.
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thank you so much, this has been bugging me. :)
Thanks for the tip; had the problem with my Helvetica in Firefox.
Moving the file to the trash worked, but the Helvetica.font file wont erase when I want to clean it out.
Any Ideas?
thx. helped!
Worked. Thanks a lot. Really cool tip.
Thanks.
PS - The font is in the system/fonts
:)
Nicholas
Glad that I can help others.
Cheers, I was wondering what on earth was going on. Thanks for the fix!
Amazing. Thanks for the fix, it was driving me crazy!
My sanity is saved! Thank you, thank you, THANK YOU!!!!
Wow. Great! Thank you so much :)
THX! i was going crazy with this bug.
Clever, nice one man… this was starting to send me postal!
Thanks for the great tip, Felix. Just updated to 10.6.2 and noticed the fonts displayed incorrectly in Firefox. But after following your instruction, everything’s back to normal now.
Again, I thank you!
Thanks, you are great!
Thank you! I tried several other solutions, but none of them were working. It was driving me insane!!
Thanks!
thank you! everything works fine now :)
That worked, thanks a lot! I was really starting to get frustrated with this issue.
That worked great. Thanks.
Thanks a lot! ;]
Thanks so much!
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