Open-source email alias service owned by Proton; self-hostable, crypto via reseller
Privacy 6.7
Safety 6.6
Email Aliases Reviewed 22 Oct 2026
Firefox Relay review
Mozilla's email-masking service; requires an account with a verified email
- Open source
- Email required
No ID mentioned KYC 1 Documentation reviewed
Privacy
6.0/ 10
Fair
Safety
5.8/ 10
Fair
Based on terms and documentation. No test transactions published yet. See the arithmetic
Firefox Relay review in short
Firefox Relay is an email alias service. Its terms put it at KYC level 1 of 4: no ID mentioned. NoKYC Score grades it 6.0/10 for privacy (fair) and 5.8/10 for safety (fair). In its favour: open source. To watch: it requires an email address. No incidents are on record.
- Category
- Email Aliases
- KYC level
- 1 of 4: No ID mentioned
- Grades
- Privacy 6.0/10, Safety 5.8/10
- Sign-up
- Email required
- Fees
- Free tier; paid Relay Premium tier
- Incidents on record
- 0
- Last reviewed
- 22 Oct 2026
Cite this review
NoKYC Score, "Firefox Relay review", reviewed 22 Oct 2026, https://nokycscore.com/service/firefox-relay
Also available as plain text.
What Firefox Relay is
Firefox Relay is Mozilla's email-masking service. It creates masked addresses that forward messages to the user's true email address, so the real address does not have to be shared with every website. The FAQ says Relay requires an account with a verified email address, limits how many masks can be generated per day, and stores emails only when the service is down, never for more than three days. Delivery relies on Amazon SES, which blocks spam and malware. A paid Relay Premium tier adds replying from a masked address and blocking promotional emails, and Mozilla also markets phone-number masking. The service's code is published in Mozilla's fx-private-relay repository on GitHub.
What Firefox Relay offers, and what to watch
1 of 13 privacy and safety features, 1 warning in its terms.
"Not stated" means its own pages do not say.
Identity
- ID never required Not stated
- No account needed No
- No email needed No
- No phone number Not stated
Payment
- Accepts Monero Not stated
- Accepts Lightning Not stated
Access
- Tor onion address Not stated
- Works without JavaScript Not stated
Trust
- Open source Yes The code that matters is public and can be inspected.
- No-logs policy Not stated
- Independent audit Not stated
- Company named Not stated
- 5+ years operating Not stated
Warnings
- May ask for ID Not in terms
- Email required Yes An email address is required to use the service.
- Phone number required Not in terms
- Closed source Not in terms
- Nobody accountable Not in terms
Does Firefox Relay require KYC?
- 0 Never
- 1 Not mentioned
- 2 Rare
- 3 On risk flag
- 4 Mandatory
KYC level 1: No ID mentioned. No identity requirement appears anywhere in the terms or documentation.
FAQ says Relay requires an account with a verified email address; no identity documents are mentioned.
How the grades add up
Both grades start at 50 points and move by fixed, published amounts. Nothing is adjusted by hand. The total is divided by ten.
Privacy
6.0- Starting points 50
- KYC level 1: No ID mentioned +12
- Open source +2
- Requires email -4
- Total, clamped to 0–100 60
Safety
5.8- Starting points 50
- Open source +8
- Total, clamped to 0–100 58
Test ledger
Real transactions run by our editors. A badge without a ledger is an assertion; this is the proof.
No test transactions published yet
The grades above rest on Firefox Relay’s terms and documentation. Tests will appear here with the date, route, amount band and result as they are run.
Incidents on record
No incidents are on record for Firefox Relay. If you have a documented case, report it.
User reviews
Reviews never change a grade. Reviews with a transaction reference are marked.
No reviews yet.
Write a review
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Firefox Relay: common questions
Does Firefox Relay require KYC?
Firefox Relay is rated KYC level 1 of 4 on this site: no ID mentioned. FAQ says Relay requires an account with a verified email address; no identity documents are mentioned.
Is Firefox Relay safe to use?
Firefox Relay has a Safety grade of 5.8 out of 10 and a Privacy grade of 6.0 out of 10. No incidents are on record. Evidence level: documentation reviewed.
Is Firefox Relay legit?
Firefox Relay is a working email alias service. Being real is not the same as being safe: its Safety grade here is 5.8 out of 10, built from custody, liquidity, track record and incidents.
Is Firefox Relay a scam?
NoKYC Score does not label services as scams; it records documented incidents with their sources and outcomes. No incidents are on record for Firefox Relay.
Do I need an account or email to use Firefox Relay?
Email required.
What fees does Firefox Relay charge?
Free tier; paid Relay Premium tier. Fees were recorded from Firefox Relay's own pages and can change; check before you send.
Does Firefox Relay have a Tor onion address?
No official onion address was found on Firefox Relay's own pages.
Can I use Firefox Relay over Tor?
Firefox Relay does not publish an official onion address.
Listing history
- Listing added. Facts and KYC level set from the service's own terms and documentation.