Can not submit this type of addon - MailExtensions

I realised that my bootstrapped addon will no longer work with TB67 so I thought, I’d better upload my Mail Extension addon for TB to start the process of having it checked.
My addon works - I use it all the time.
I fell at the first hurdle.
When I uploaded the file I was told I was not able to submit this type of addon. What exactly is the problem. If it is because it has a WebExperiments api - why are we told how to construct it if we can’t then submit it?
How can I get this addon submitted?

Moved this to the TB add-ons section since that’s where you’re much more likely to get a response than in Firefox Add-on end-user support section.

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There are mail extensions on ATN, so perhaps yours has an invalid formaT. Perhaps post a link to your code?

Thanks Dave for your comment. I found out in another place that the problem was that my addon included a WebExperiment and to submit this form of addon requires that you are on a list… I’m in the process of applying for that.