Yeah Frank, one of the biggest problems with Opera is, if it (3rd party software) does not support actual web standards, it is up to the supplier of software to support all standards...
Move supports IE (did not specify which IIRC) and Firefox 2&3.
As for the correction of FF/Fx.. I was not directing it at you but everyone, hell even the title of this thread (Being FireFox and hence the FF confusion) Opera 10's in-line spell checker is telling me it is wrong. (uploading a pic so you can see)
But for others that may question my assumption of calling Firefox FF is this simple google search
how is firefox abbreviated (click me)
(when you click the link it is FAQ question number 8. Would have linked directly to new site, but did not see FAQ on the homepage sorry. (yup I am a lazy tonight)
(heh heh I never used it before, but ctrl+z the windows undo edit, works in forum posts *duh I know... but removing those functions could really help performance in benching (side note toself))