Thank you for reporting this to Ubuntu. While .xpi files are used in Firefox, there are also used in other applications based on xulrunner such as Thunderbird or Songbird. It is not clear from the extension which application should be opened. Therefore, I am marking this as won't fix. Please feel free to report any other issues you may find.
** Changed in: firefox-3.0 (Ubuntu) Status: New => Won't Fix -- *.XPI should be associated with Firefox in KDE https://bugs.launchpad.net/bugs/385128 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