1) Either the default browser of thunderbird points to the default set by kcontrol.
2) Either kcontrol should update x-www-browser.
However, as far as I know, option (1) is not portable across different desktop environments, while option (2) requires root privileges and it is system-level rather than user-level.
Perhaps someone from the Kubuntu Team can provide some insight on this issue.
On the other hand, perhaps we need a "update-alternatives" tool that works on the user-level also.
Actually, there are only two solutions:
1) Either the default browser of thunderbird points to the default set by kcontrol.
2) Either kcontrol should update x-www-browser.
However, as far as I know, option (1) is not portable across different desktop environments, while option (2) requires root privileges and it is system-level rather than user-level.
Perhaps someone from the Kubuntu Team can provide some insight on this issue.
On the other hand, perhaps we need a "update- alternatives" tool that works on the user-level also.