On my setup – Firefox 1.0, KDE 3.2, Thunderbird 0.9, Slackware 10 – clicking on a
mailto: link in Firefox does nothing; I wanted this to open a new message in Thunderbird, email address pasted in and ready to go. Thanks to Google, I found the answer pretty quickly – add this line to your
Just remember to change
/usr/bin/thunderbird to the appropriate path for your installation.