Newbie question about 32-bit vs. 64-bit

Hi. Sorry for the naive question.

I understand 4MLinux is a 32-bit distro. With so many applications abandoning 32-bit support, what does that mean for users like myself who use applications like Chromium and Thunderbird? I understand Chromium/Chrome is stopping support for 32-bit versions. Not sure what Thunderbird is planning.

Thanks for any help here.