How do I change the default applications for http, ftp and https in Mozilla Thunderbird?

Add the following entries to prefs.js under your profile (~/.thunderbird/default.50c/prefs.js)

user_pref("network.protocol-handler.app.http", "/location/to/browser");
user_pref("network.protocol-handler.app.http", "/location/to/browser");
user_pref("network.protocol-handler.app.ftp", "/location/to/ftpprogram");

Check http://www.wlug.org.nz/MozillaThunderbirdNotes

salvaged from Wayback Machine at 2025-12-05, , original timestamp 2005-11-23
Add the following entries to prefs.js under your profile (\~/.thunderbird/default.50c/prefs.js)