There are still free e-mail servers. Just search for one.

Charging for services "flies in the face" of the open source software scheme that Mozilla has embraced from the beginning. But this support forum isn't the place to request or discuss new features; using the Help > Submit Feedback ... in the Firefox menu will take your here: https://qsurvey.mozilla.com/s3/FirefoxInput/ where you can ask questions such as that and request new features for consideration by those in charge.

That said, I saw a thread yesterday over @reddit where a new feature related to email / webmail was mentioned as being developed under the Firefox Monitor program that will "screen" your email to prevent "clutter". https://old.reddit.com/r/firefox/comments/fhu130/firefox_monitor_is_piloting_an_email_alias_service/

Here is the Mozilla page for that new / upcoming feature: https://monitor.firefox.com/protect-my-email

It uses an "alias" to mask your email address (with a login via the Firefox Accounts system); once each email is verified the email is forwarded to your true email address. As you get spam you "tell the Monitor" that you don't want email from the sending email address and in the future email from there will be blocked and won't be sent to your email address.

.......

Sorry about your mental confusion. Is that my fault for providing you with information about what Firefox does have that might be of use to you, or soon will have that might be helpful to you? BTW, that message in that image was rude and unnecessary.

And don't play the befuddled senior crap game with me old man, I turned 70 yo last year. I was using a Sinclair ZX80 personal computer in 1980 that used cassette tapes for data storage, so DOS and 180kb diskettes were a vast improvement when the IBM-PC arrived a few years later.

-) ...