What is a "beta" add-on

I’ve received e-mail claiming that some of my add-ons are beta and will be
dropped at the end of this month. As far as I know they aren’t beta. They
aren’t according to this specification from MDN:

If you understand RegEx format, here's what we look for in the version 

number: “(a|alpha|b|beta|pre|rc)\d*$”.

When a file meeting this version number criteria is uploaded to AMO, it 

will automatically be detected as a beta version.

I do have 2 add-ons flagged as experimental. Does this count as beta?

Experimental is not the same as beta. Add-ons can have beta versions, which is what the email is referring to. The show up as Beta in the Status & Versions page of your add-ons.

That’s what I would have thought. I have never released a beta version. But your e-mail said I have at least one beta version. The e-mail makes me think that AMO is going to disable something of mine.

Perhaps there is a bug in that being marked as experimental is being misinterpreted as beta. I’ve removed the experimental mark.

I doubt it. If you point me to your add-ons or your user profile, I can try to figure out why you got that email.

I am at
https://addons.mozilla.org/en-US/firefox/user/als123/

You received that mail due to https://addons.mozilla.org/en-US/firefox/addon/blacken/versions/beta

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Well how about that. A 7 year old version. It doesn’t even appear on the normal version listing so I didn’t notice it. There doesn’t appear to be any way to delete it.

I suppose I can just ignore it?

Yeah, you don’t need to worry about it. You can hide or delete old listings in the Status & Versions page if you want to, which will also filter them out of any messaging related to them.