Hi cloudi, Firefox 67 introduces a new default-release profile and incomplete migration is creating problems for some users. They need to manually switch back to their older profile using the about:profiles page. Please check whether you can do that, using the “Set as default profile” button and definitely do not use the Remove button there.
For more assistance with Firefox 67 issues, please try Mozilla Support: https://support.mozilla.org/
Regrettably, it has a separate sign-on system, so yet another login!