This may help-just installed Chrome as an extra browser-skip importing Firefox profile on download -went back to Firefox 5 -nice surprise to find Real download button working. Can't help on why -just pleased!

There is one line in the toolbar that Real installs into Firefox that indicates the versions with which the Real toolbar is compatible. Real needs to test their toolbar, make any necessary changes (probably none between Firefox versions 4 & 5), change the line that indicates which versions of Firefox are compatible, and release the changed version of their program. This should be a relatively easy thing for them to do, and it could have been done during the 4 week testing period that Firefox had 7 beta versions, but some vendors choose not to take advantage of that testing period everytime. Real is one of those that is always late in getting their testing done; security applications that add toolbars, Google toolbar, Yahoo toolbar, etc., are others.