I have also run into this bug. It's very annoying. If you set the mark "Do this autmatically for files like this from now on." firefox actually says right there that "Settings can be changed in the Downloas section of Edit, Preferences". Only that you can't. The dialog that opens there is always empty. (This is the bug)
That would be bad enough. But now imagine (this has actually happened to me) that a user installs realplayer and instructs firefox to always open certain videos with firefox. Sometime later the user finds out that totem is much better and dumps realplayer. But sadly now the videos don't play at all anymore! Firefox doesn't find realplayer and complains. And there's no way to change the association in the options. So the user is now stuck with a severely broken browser. The fix mentioned above works but I don't think we can expect normal users to do something like that. ** Changed in: firefox (Ubuntu) Status: Unconfirmed => Confirmed -- Helper applications cannot be changed, even when asked to do so by Firefox. https://launchpad.net/bugs/55428 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs