I'm also now getting something similar to bug 888307 - ubufox 0.9~rc2-0ubuntu2.1 is disabled, with a message stating it is incompatible with Firefox 9.0.1. Upgrading to ubufox and xul-ext-ubufox 0.9.3-0ubuntu0.10.04.1~mfn2 from the "Official PPA for Firefox Beta" (owned by Mozilla Team) seems to have fixed this, but of course this workaround is not suitable for many end-users.
I've upgraded to Firefox 9.0.1+build1- 0ubuntu0. 10.04.1 from lucid-proposed. Bug 744580 and bug 758111 still exist.
According to comment #6 in bug 758111 the fix only applies to a new profile, so perhaps bug 758111 should be removed from the "changelog bugs" column at http:// people. canonical. com/~ubuntu- archive/ pending- sru.html ?
I'm also now getting something similar to bug 888307 - ubufox 0.9~rc2-0ubuntu2.1 is disabled, with a message stating it is incompatible with Firefox 9.0.1. Upgrading to ubufox and xul-ext-ubufox 0.9.3-0ubuntu0. 10.04.1~ mfn2 from the "Official PPA for Firefox Beta" (owned by Mozilla Team) seems to have fixed this, but of course this workaround is not suitable for many end-users.