Every time a new version of Firefox or Thunderbird comes out, it becomes impossible to open links in FF from TB and vice versa. Here’s what to do: Go into /usr/lib/thunderbird-2.0.0.23/thunderbird.cfg as root. Change it to read: pref(“network.protocol-handler.app.http”, “mozffremote”); pref(“network.protocol-handler.app.https”, “mozffremote”); pref(“network.protocol-handler.app.ftp”, “mozffremote”); pref(“network.protocol-handler.app.http”, “/usr/lib/firefox-3.5.3/firefox”); pref(“network.protocol-handler.app.https”, “/usr/lib/firefox-3.5.3/firefox”); pref(“network.protocol-handler.app.ftp”, “/usr/lib/firefox-3.5.3/firefox”); In FF: edit > preferences > … Continue reading Thunderbird and Firefox integration problem