Diễn đàn hỗ trợ Firefox

I am leaving my old email site. I attempted to add the email address that will eventually become my primary ( ID) but it says that email address already exists...but it is not listed anywhere in Firefox (Mozilla ) that I can find. Typically software issues ..day in the life crap.

I recently discovered a problem with an addon I wanted to report. The product page only has an email support link, which opens up MIcrosoft Mail. I prefer not to use it.

Is there any other way to get the developers email address?

Also, this link does not work