Update Breaks Hotmail on Linux

I have had the same Hotmail account for about ten years. I have always been able to work with my Hotmail account through Firefox on GNU/Linux. Microsoft recently updated Hotmail and the update has broken compatibility with Firefox on Linux.

While I'm able to start a new message and type-in addresses and subjects, it is not possible to type any text in the message field.

After a brief search I found that others have also noticed this problem. I don't know if this is intentional on MS' part or if it is a bug. I am attempting to contact Microsoft to get to the bottom of this problem. I'll add to this post as more info becomes available.

UPDATE:
After researching further this appears to specific to Iceweasel. Although Iceweasel is really Firefox renamed, apparently the "Iceweasel" UserAgent ID prevents it from working properly with Hotmail. Instructions for changing the UserAgent ID can be found here.