!! Firefox 0.9.1 (and mozilla and thunderbird) Exploit Fix
I've never run into any shell: links before, but you never know. You can click here to see if you're vulnerable. (it'll go to shell.com if you aren't) Otherwise grab this XPI and restart your browser after it installs. More info on MozillaZine and Full Disclosure. I sent that shell: link above over MSN and it automagically converted it to a link, which IE would then execute (if IE is your default browser), kinda funny.