Opening Yahoo Mail From Another Tab

I've re-installed F'fox 3.6.6 due to incompatibility to too many addons with 3.6.10. However, I also spend quite a bit of time sending e-mails from CraigsList.com. Before I retro'ed back to 3.6.6 I was able to click on a link in CL.com, and up would come up my Yahoo e-mail acct with the e-mail "To:" box AND Subject field already populated with the link and subject from CL.

So, what adjustment can I make to have that as the default?

GPLea

 

you'll find your answer here: http://kb.mozillazine.org/Changing_the_mail_program_used_in_Firefox

 

Thanks Bro. I thought it was somewhere/something like that.