Could it be some of the new antivirus and antimalware programs I recently installed are interfering someway? I just began a free 130 day trial of the Avir Premium Security Suite, which has a firewall and email protection. I also have Adaware Free Internet Security, which does not have a firewall, and I turned off the antivirus engine for that program. And I also installed Emisoft Antimalware. Both are in active protection mode. I am wondering if I should stop the file guard in Emisoft.
I am able to copy the link location of the hyperlink in the Thunderbird email and then paste it into an internet browser to access the hyperlink URLs, but the hyperlinks inside Thunderbird emails used to work. Also, I just made Thunderbird the default email linked to my IE9, but that did not help either.