Since yesterdays (6/20/12) Firefox update to v 13.0.1 I haven't been able to write a new email using Yahoo mail. Symptoms are: -The autocomplete feature for addresses doesn't work -It takes a long time ~ 3 minutes with the message "loading attachment updater" for the applet that attaches files to emails to load. - And then Firefox freezes and I have to use the Apple "force quit" feature to exit Firefox. Yahoo mails works fine if I use Safari.