For some time now I have been having a bit of a problem with Thunderbird. Whenever I clicked on a link within a mail, it opened a new Firefox window but defaulted to the home page.
I got tired of copying and pasting links so searched for a solution. As usual, my search returned loads of solutions, none of which worked. The main cure given was to force both Firefox and Thunderbird to declare themselves as the default. No good.
The solution is (as always) simple.
In Thunderbird, open Preferences –> Advanced. Select the General tab and click on “Config Editor..”. You will get a warning which you accept. This brings up the “About:config” window.
Scroll down to (or search for) “network.protocol-handler.warn-external.http”. Right click and select “Toggle” (i.e. set the value to “True”). Do the same for ““network.protocol-handler.warn-external.https”.
Next time you click on a link within a mail you will be asked to choose an application. Select Firefox (default location – /usr/bin/firefox ). Select “Remember my choice…” and the problem is solved.