I have been experiencing the same issue in Luicd since beta 1. In order to install add ons I've had to boot into windows and save the xpi files.
AMD64 firefox 3.6.3+nobinonly-0ubuntu3 (lucid) -- Cannot download addons from Mozilla server https://bugs.launchpad.net/bugs/488996 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs