I'm using The Bat as my e-mail client

In case it isn't obvious, this is the Thunderbird support forum.

When I click on the link, ... nothing happens in Firefox.

This may help. https://support.mozilla.org/kb/hyperlinks-in-messages-not-working

I'm sorry. Didn't know this was a Thunderbird forum. The link that you sent to me (had to copy and paste) didn't work. I had to remove the ". Anyway, have done all of this and can't find an answer. Thank you.

Patzilla said

I'm sorry. Didn't know this was a Thunderbird forum. The link that you sent to me (had to copy and paste) didn't work. I had to remove the ". Anyway, have done all of this and can't find an answer. Thank you.

The link works for me and not for you. That sounds like a clue to the problem if you have this weird ". in the link Perhaps just uninstall you anti virus program. They are well know to cause all sorts of issues.

But I will transfer this to the Firefox forum, perhaps a firefox specialist might have some suggestions..

Thank you Matt. I appreciate you passing this on to the specialists since I've done everything to try to solve this myself.

What do these links look like if you paste them in the location/address bar?

Are that valid URLs with the proper protocol (https/http) and nothing appended?

Yes, for example...the one I pasted to get to your response: https://support.mozilla.org/en-US/questions/1254508?utm_campaign=questions-reply&utm_medium=email&utm_source=notification