I also have this problem.... Apple have advised me to use Safari in the mean time. However I have been using Firefox for many years and would prefer to keep using Firefox. Please advise when this problem has been fixed. Thanks.

I can use either Safari or IE and everything works as normal. As much as I like FireFox I guess I am forced to stop using. This is sad - hopefully they will fix their new update

I, too, have had to switch to Safari after using Firefox for many years. It's useless for me if I can't attach any document to an e-mail. Is Firefox working to fix this problem?

identical problem as ljfelix and all others. really frustrating. went to Apple Genius bar today and no solutions on their part. glad safari available. plan to look for secondary browser. any suggestions?