I followed the advice found in this forum ( Rui Pais, via Michael "TheZorch" Haney) and updated the Thunderbird config statement to designate Firefox the HTTP link handler and it worked. The question remains: what happened that it was absent?
I followed the advice found in this forum ( Rui Pais, via Michael "TheZorch" Haney) and updated the Thunderbird config statement to designate Firefox the HTTP link handler and it worked. The question remains: what happened that it was absent?