It never did. See below.
Current Thunderbird no longer accepts parameters in the network.protocol-handler.app.http preference. I suspect other similar prefs (https, ftp etc) are also afflicted but I have not tested this.
For example I have Galeon set as my HTTP handler, with the following
custom start script in Gnome->Desktop Preferences->Advanced->Preferred
Applications:
/usr/bin/galeon -n %s
(launch a new tab not window).
This works for me. In order to use the gnome way of setting the browser command you have to choose GNOME as mode during installation (try dpkg-reconfigure mozilla-thunderbird). I guess you have either Debian Mode oder None selected.
Clicking a URL in Thunderbird results in a new Galeon window launching
instead. This behaviour is duplicated when an explicit override is
placed in thunderbird user prefs.js:
user_pref("network.protocol-handler.app.http", "/usr/bin/galeon -n");
This never worked and will not work in future. Using the protocol handler pref just cannot take parameters.
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