S
SFirefox Relay vs Guerrilla Mail
Pricing, features, platforms and who each one suits — side by side.
F
Choose Firefox Relay if…
- you're in its core audience: privacy-conscious individuals, firefox users
G
Choose Guerrilla Mail if…
- you need custom domains
- you're in its core audience: privacy-conscious users, developers and qa testers
Side by side
Feature Firefox Relay Guerrilla Mail
PlatformsWeb, ChromeWeb, API
CategoryEmail & phone aliasesTemporary email
CompanyMozillaJamit Software Limited · since 2006
Full feature lists
F Firefox Relay
- Random email masks that forward to your real inbox
- Masked phone number that forwards calls and texts
- Removal of email trackers from forwarded mail
- Blocking of promotional emails while keeping receipts
- Personal mozmail.com subdomain for instant masks
- Anonymous replies to emails and texts
- Dashboard to label, create and block masks
- Browser extension for creating masks on any site
G Guerrilla Mail
- Instant random disposable inbox without signup
- 11 shared domains to choose from
- Scramble address and Forget Me controls
- Compose and send email
- Custom domain support for $9.99/year
- Public API
- Open-source Go-Guerrilla mail server backend
- Interface in 15+ languages
Their home pages
What each vendor shows first: the pitch, the plans and the sign-up.
Firefox Relay · relay.firefox.com
Guerrilla Mail · guerrillamail.comWhat you'd pay
The cheapest plan that fits, per month, billed yearly where the plan offers it.
Work it out for your team
- Guerrilla MailCustom domain$0.83/mo
- Firefox RelayEmail protection$0.99/mo
The cheapest paid plan with a published price that fits. Custom and sales-quoted plans aren't included.
All plans and prices
Firefox Relay
Limited email protectionFree
Email protection$1.99/mo or $0.99/mo billed yearly ($11.88/yr)
Email & phone protection$4.99/mo or $3.99/mo billed yearly ($47.88/yr)
Add VPN protection$6.99/mo billed yearly ($83.88/yr)
Guerrilla Mail
FreeFree
Custom domain$9.99 USD/year
Strengths and limitations
Firefox Relay
- Free tier includes 5 email masks and tracker removal
- Source code is public on GitHub
- Combines email and phone masking in one service
- Browser extension rated 4.1/5 from over 1,250 reviews
- Free plan is limited to 5 email masks
- Premium tiers are waitlist-only
- Premium is available only in certain countries
- Not recommended for identity-verified emails or ones that need attachments
Guerrilla Mail
- Free to use with no registration
- Many alternative domains available
- Mail server is open source
- Custom domain option costs only $9.99 a year
- Free version shows ads
- Custom domain payment only via Bitcoin or PayPal
More comparisons
Other options to consider
SS
Free, from $3/mo
S
Open-source email aliases to hide your real address and block spam
Email & phone aliasesFree planAPIOpen source
A
AOpen-source email aliases that forward to your inbox and hide your real address
Free, from $1/mo
A
Free, from $1/mo
A
Open-source email aliases that forward to your inbox and hide your real address
Email & phone aliasesFree planAPIOpen source
T
TT
Free, from $5/mo
T
Disposable temporary email addresses to avoid spam and protect your inbox
Temporary emailFree planAPI
1
11
Free
1
Free disposable email address that expires after 10 minutes, no signup
Temporary emailFree plan
Facts from each vendor's public pages, prices checked Nov 7, 2026. Editorial policy