I'm trying to add Thunderbird as one of the apps that can be accessed via an icon on the tool bar. I can't find the way to do it.

I added the following line to settings > Edit IceWM settings > toolbar:

prog"Thunderbird" /usr/share/pixmaps/thunderbird.png /usr/lib/thunderbird

/usr/lib/thunderbird is the path to the executable and /usr/share/pixmaps/thunderbird.png is the path to one of the icons I found for the app.

Nothing appears on the toolbar, though. What am I doing wrong?

Try this: (bin not lib)

prog"Thunderbird" /usr/share/pixmaps/thunderbird.png /usr/bin/thunderbird

Thanks a lot! That worked.