It's something good to be able to block your e-mail address, but some websites give an error message that says "this domain is not allowed". But also others can use it for spam and block their e-mail address as well.

My mail uses my surname so I don't wanna use it when logging on some stuff that I don't know if I can trust, that's why I'm grateful mozilla for making this addon. It may not work on every site because sites like blocking mails other than Gmail, Outlook etc. but there's nothing we can do about that.

Saved me a lot of headache and i am thankful for it !!!

I have used it before, but I feel bad that I need VPN in China. I hope I can support it in China. If I do so, I will use it.

Simplelogin is an obvious choice.

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