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I'm trying to use Dolphin as file chooser for Firefox in Archlinux instead of Nautilus. I've read this but it did not solve my problem. The config seems related to firefox as

xdg-mime query default inode/directory

Which is right. Also

cat /usr/share/applications/mimeinfo.cache | grep  x-directory/gnome-default-handler

Seems to be right too. What am I missing?

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Admittedly, I'm not sure about this at all, but does X need to be restarted before those changes take effect? – HalosGhost Jul 28 '14 at 7:04
@HalosGhost I have not restarted X. Just firefox, I will double check on this one. – vfbsilva Jul 28 '14 at 14:22
Just restarted X no change at all. – vfbsilva Jul 29 '14 at 1:51
Which file chooser are you referring to? The one you see when using File -> Open or when you're trying to save a file? I don't think you can change that, that's the file chooser dialog provided by Gtk. – Wieland Jul 29 '14 at 9:41
@Wieland the one from file open... – vfbsilva Jul 29 '14 at 13:15

Type "about:config" in the address bar

Search for ui.allow_platform_file_picker

Toggle it to "true"

Restart Firefox.

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