Firefox Relay

Spec sheet

What it does

Firefox Relay creates masked email addresses and phone numbers that forward messages, calls, and texts while concealing the user's real contact details.Read 15 Oct 2026 · relay.firefox.com

Purpose

Relay creates masked email addresses and phone numbers for sign-ups and forwards emails, calls, and texts while concealing the user's real contact details.Read 3 Oct 2026 · relay.firefox.com

Support

Relay provides a support site and a contact support option for users who need help.Read 3 Oct 2026 · support.mozilla.org

Founded

1998Read 28 Sep 2026 · relay.firefox.com

Maker

Mozilla says the Mozilla Project is a global community that has worked together since 1998; the opened About page does not state a headquarters.Read 3 Oct 2026 · mozilla.org

Abuse controls

Relay requires a verified email account and rate-limits daily mask creation to deter malicious use.Read 15 Oct 2026 · relay.firefox.com

Add-on complaint: mask limit mismatch

Firefox Add-ons reviewers reported that the extension still displayed a five-mask limit after the service limit had increased to 50.Read 15 Oct 2026 · addons.mozilla.org

API authentication

The API documentation lists Mozilla-account token authentication and cookie authentication for protected operations.Read 15 Oct 2026 · mozilla.github.io

API surface

The public API documents authenticated endpoints for listing, creating, updating, and deleting email masks plus phone, SMS, and call operations.Read 15 Oct 2026 · mozilla.github.io

Attachment limit

Forwarded emails larger than 10 MB are not delivered.Read 15 Oct 2026 · relay.firefox.com

Availability

Free Relay is offered in most countries, while Premium is listed for selected European countries plus Canada, Malaysia, New Zealand, Singapore, the United Kingdom, and the United States.Read 15 Oct 2026 · relay.firefox.com

Browser and mobile access

Masks can be generated from other browsers or mobile devices by signing in to the Relay dashboard.Read 15 Oct 2026 · relay.firefox.com

Browser and mobile use

Users can generate masks on other browsers or mobile devices by signing in to the Relay dashboard.Read 3 Oct 2026 · relay.firefox.com

Dashboard

The dashboard lets users create and label masks and block calls, texts, or emails from masks receiving too much spam.Read 3 Oct 2026 · relay.firefox.com

Data collection

Relay records the websites where masks were used and lets users opt out of that labeling and synchronization.Read 15 Oct 2026 · relay.firefox.com

Developer documentation

Mozilla publishes generated API reference documentation with request schemas, response examples, authorization details, and endpoint paths.Read 15 Oct 2026 · mozilla.github.io

Email mask forwarding

Email masks are private addresses that forward messages to the user's true email address.Read 3 Oct 2026 · relay.firefox.com

Email masks

Masks can be generated for websites, applications, stores, or restaurants and managed from a dashboard.Read 15 Oct 2026 · relay.firefox.com

Email replies

Premium users can reply to a forwarded email within three months of receiving it; adding CC or BCC exposes the original email address.Read 3 Oct 2026 · relay.firefox.com

Extension availability

The Firefox Relay extension listing says it is available on Firefox for Android.Read 3 Oct 2026 · addons.mozilla.org

Extension permissions

The Firefox add-on requests access to data on all websites to provide its masking workflow.Read 15 Oct 2026 · addons.mozilla.org

Extension version

The Firefox add-on page lists version 2.8.1, a 1.21 MB package, and a last update of December 6, 2023.Read 15 Oct 2026 · addons.mozilla.org

Forwarding limit

Relay does not forward email attachments larger than 10 MB.Read 3 Oct 2026 · relay.firefox.com

Important-use warning

Mozilla advises using a real address for banks, doctors, lawyers, identity verification, and messages requiring important attachments.Read 15 Oct 2026 · relay.firefox.com

Licence

The fx-private-relay repository is licensed under the Mozilla Public License 2.0.Read 15 Oct 2026 · github.com

Limit: anonymity concerns

Chrome-Stats records reviewer concerns that replying can expose the underlying email address and that refund handling is unclear.Read 15 Oct 2026 · chrome-stats.com

Limit: paid features

Chrome-Stats says reviewers complain that full functionality requires a subscription and that free use is limited.Read 15 Oct 2026 · chrome-stats.com

Limit: site breakage

Chrome-Stats summarizes reports that Relay can break sign-in forms and checkout flows on some sites.Read 15 Oct 2026 · chrome-stats.com

Maker company facts

LinkedIn lists Mozilla as a privately held software company founded in 2005, headquartered in San Francisco, with 501–1,000 employees.Read 15 Oct 2026 · linkedin.com

Maker ownership

Mozilla Corporation is wholly owned by the nonprofit Mozilla Foundation.Read 15 Oct 2026 · linkedin.com

Password manager integration

Mozilla Support describes integrating Relay into Firefox Password Manager to generate or reuse email masks from email fields.Read 3 Oct 2026 · support.mozilla.org

Phone masking

The phone feature supplies a masked number that forwards calls and texts to the user's real number and supports replies.Read 15 Oct 2026 · relay.firefox.com

Praise: privacy

Chrome-Stats summarizes repeated praise for aliases that forward to real inboxes, reduced spam, and easier signups without exposing a real address.Read 15 Oct 2026 · chrome-stats.com

Praise: usability

Chrome-Stats reports that reviewers commonly describe Relay as easy to use, automatic, and well integrated into online workflows.Read 15 Oct 2026 · chrome-stats.com

Privacy data

Relay collects which websites users have used masks on and associates those sites with the masks; users can opt out of that collection in settings.Read 3 Oct 2026 · relay.firefox.com

Promotional blocking

Premium promotional-email blocking attempts to pass receipts, password resets, and confirmations while filtering marketing messages.Read 15 Oct 2026 · relay.firefox.com

Promotional email blocking

Premium promotional blocking may block important messages, and blocked email cannot be recovered.Read 3 Oct 2026 · relay.firefox.com

Rating on Chrome-Stats

4.16 out of 5 from 2,190 ratingsRead 15 Oct 2026 · chrome-stats.com

Rating on Firefox Add-ons

4.2 out of 5 from 2,241 reviewsRead 15 Oct 2026 · addons.mozilla.org

Rating on Trustpilot

2.7 out of 5 from 7 reviewsRead 15 Oct 2026 · trustpilot.com

Reply window

Premium users can reply to a forwarded email within three months of receiving it.Read 15 Oct 2026 · relay.firefox.com

Self-hosting

The public repository explains how to run the Relay site locally and lists Python, PostgreSQL, Node/npm tooling, and Amazon SES requirements.Read 15 Oct 2026 · github.com

Service availability

Free Relay is available in most countries, while Premium is available in the countries listed on its pricing page.Read 3 Oct 2026 · relay.firefox.com

Site compatibility limit

Some websites reject masked addresses, including subdomain addresses or any address outside Gmail, Hotmail, or Yahoo domains.Read 15 Oct 2026 · relay.firefox.com

Temporary storage

If forwarding is disrupted, Relay may temporarily retain messages but says it will not keep them for more than three days.Read 15 Oct 2026 · relay.firefox.com

Tracker removal

Relay removes known email trackers from forwarded messages when the account setting is enabled.Read 15 Oct 2026 · support.mozilla.org

Trustpilot complaint: phone forwarding

A Trustpilot reviewer reported that calls did not forward reliably and that some services reject phone-forwarding numbers for text-code authentication.Read 15 Oct 2026 · trustpilot.com

Trustpilot complaint: subscription transparency

A Trustpilot reviewer said subscription requirements were not clear during signup and described the service as unsuitable for everyday use.Read 15 Oct 2026 · trustpilot.com

Plans and prices

Every Firefox Relay plan and price →

Where Specifiction places it

• Mobile Browser Software#2 of 318.9
• Email Alias Services#4 of 238.7
• Secure Browser Software#5 of 188.8