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I have recently installed kubuntu alongside Arch with Kde and decided to use Firefox as my default browser because I'm not very fond of rekonq.

Some time after I installed it I realized that my downloads did not have icons and Firefox sometimes had trouble opening them appropriately.

Is this a bug or some misconfiguration? If it's the latter, how can I solve it?

Here's picture illustrating the icon issue: enter image description here

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This is a known issue. Previous versions of Ubuntu included a firefox-kde-support package that allowed Firefox to use KDE's file dialogs, open-with settings, etc.. But the maintainer quit, and the package was removed from Ubuntu 12.04. It falls back to Firefox's built-in application chooser, which is useless garbage.

See also:

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I don't believe it's a firefox bug judging by the age of the report and the face that it works in Arch. It seems to be a packaging bug on ubuntu's side. I partially solved it by installing the blue-shell ppa, which now maintains firefox-kde-support and I now have proper mime-type support and native dialogs but still no icons. – vitiv Dec 2 '12 at 9:33
@vitiv: The Firefox bug is that Mozilla doesn't provide KDE support, which forces distributions to do it themselves. In Ubuntu's case, they gave up. – Mechanical snail Dec 12 '12 at 6:01

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