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On Kubuntu 11.10, when I set the KDE default browser to /usr/bin/firefox then clicking links in Thunderbird opens them in a new Firefox window instead of the already-open Firefox window. However, when I set the KDE default browser to /usr/bin/firefox %U then clicking links in Thunderbird does open them in the currently-open Firefox instances, but causes all other applications (Zim, LibreOffice) to open their links in a new Firefox window instead of the already-open Firefox window! Is there any way out of this catch-22?

Thanks.

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up vote 0 down vote accepted

The solution was to set Thunderbird's network.protocol-handler.app.http preference to /usr/bin/firefox %U.

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