I have the same problem. In fact I couldn't even register for this forum without closing out of Mozilla and opening it up again because it was doing the same thing in the fields of the registration form. That would have been okay (because I can compensate by pressing the right arrow key with each letter) but for the fact that my "@" key kept typing " instead of @ so I couldn't type my email address. I tried all of the symbol keys and they seemed to be normal. Just that one key wouldn't work and no other key would type an "@" either. I thought this strange also because even though the cursor keeps moving back in the address field, normally the fields on the web pages themselves are okay. Just this one instance trying to register for the forum it wasn't. I'm very relieved this is just a mozilla problem & that it resolves itself on closing and reopening. At first I thought it was a virus.
