How to install thunderbird

Dear ricklinux,

You have helped me several times in the past (even way back on Antergos) so here is another question I have for you.

A few years ago I had thunderbird installed on a computer (I believe I was using MX Linux at the time) and it worked perfectly but I was never able to find where the messages were stored locally on my computer so I could back them up to an external hard drive. So I stopped using it, merely just using GMail.

Can you tell me where I could find the thunderbird folder within EOS so that I would be able to back up my stored messages onto a separate drive?

Thanks.

Lawrence