I am quite upset that they have not created a fix for Nightly. They do not like to create versions for betas and this one is in aurora, so I am sure they are unhappy. On the other hand, we are now paying and they need to work to satisfy us a bit faster.
I added in the compatibility Reporter, but that does not seem to work for Roboform and Nightly does not even see the toolbar, let alone disable it.
It may make sense to uninstall 4 in which it worked and then try downloading Roboform again.
If this is successful, I will report back. If not I am really ticked off.