In Firefox 5.0 on Ubuntu 11.04, Bindwood is disabled as "incompatible with FF 5.0". The xpi on Launchpad can't be installed for the same reason.
I'm aware of various bug reports concerning bookmark sync, and indeed I never actually got it working in earlier versions of Ubuntu and Firefox, but this Bindwood incompatibility seems to close off any prospect of getting it working.
I know about Firefox's own sync, too, but I'd rather get Ubuntu One's working, partly so as not to have to set up yet another account.
Is a fix being worked on, or am I missing something? I had thought the latest Ubuntu would offer the best chance of working bookmarks sync.
Looks as though Firefox's built-in sync may be the answer, after all. Expecially as, following another routine upgrade, I'm now using Firefox 6. That's too bad - but I guess Ubuntu could argue it's not worth their while to duplicate something that now works in Firefox.