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Firefox Adds Masking to Better Help With Email Spam and Tracking
(www.lifewire.com)
A place to discuss the news and latest developments on the open-source browser Firefox
Proton Pass has a similar feature, I love it. But Spotify had banned my account and asked me to email them from the alias to unlock it, which is not possible. So you should be careful with that. A lot of companies employ anti-privacy practices.
SimpleLogin does allow you to send emails from your alias, though