Roboform doesn't support Nightly or Aurora, which are both "alpha" versions of what will eventually become a Firefox release version. I'm not sure if they even support Firefox Beta versions. You would have to check with Siber Systems support to see if they have regular user's doing Beta testing of Roboform in Firefox Beta,

Their program, they decide what they support.

Thank you, rpiner, for raising this question. Thank you, edmeister, for answering it. You saved me a lot of time beating my head against the wall trying to fit a square peg in a round hole. I hope Siber Systems comes through eventually.

It's a lot more work to support the the alpha versions, which may have code changes daily, than it is to support Release versions only. Few 3rd party add-ons support alpha versions of anything.

Working fine for me on FF18 beta4... (PortableApps edition) (Roboform Lite v.3.1.0 anyways)

How I did it: (With Roboform Lite v.3.1.0 working in Portable FF 17x.)

1. Used FEBE to backup all extensions from FF17 portable.
2. Installed FEBE into FF18.
3. Restored everything to FF18 in new "Profile."
4. Added ProfileSwitcher to FF18.
5. Now load FF18beta4 & use ProfileSwitcher after loading FF17.

(profiles are not supported yet either via the command line apprently, but ProfileSwitcher takes care of this)

Now FF18 beta4 has all my add-ins.... (more "fluid" & smoother than FF17) (PortableApps version even updated automatically from beta3 to beta4)  :-)