Since recent Firefox update, Yahoo mail won't let me send messages, reply, delete, or move mail to another folder. I can't mark the mail as important, or close an email I've opened by x-ing out of it. I can only open an email and can get back to my email folder by clicking on the folder. Pretty much unusable. In safe mode it has the same problem. I tested my Yahoo mail using Chrome and it works the way it's supposed to, but I much prefer Firefox. Thank you.