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Firefox Relay vs SimpleLogin: catalog facts
Firefox Relay	SimpleLogin
Freemium Free tier with a limited number of masks, paid plan for unlimited masks and a custom…	Freemium Free tier available, with paid plans for more aliases and features; owned by Proton.
Web, Browser extension	Android, Web, Browser extension
Backed by Mozilla, a long-standing name in browser privacy Simple mask creation directly from the browser	Open source alias generation with the backing of Proton Aliases can be disabled individually to stop spam without changing your real address
Free tier limits the number of masks available Deeper integration is tied to the Firefox browser ecosystem	Best features and higher alias limits require a paid plan Now tied into the Proton ecosystem after the acquisition
Web application, Browser extension	Web application, Browser extension
Closed source	Open source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.