Email Monster vs Firefox Relay: Which Email Alias Service Is Better in 2026?

Last updated: April 2026

Email Monster is a disposable email forwarding service that creates unlimited aliases on the fly with customizable names, forwards to any inbox, and bundles newsletters into weekly or monthly digests. Firefox Relay is Mozilla's email masking service that generates random aliases through a Firefox browser extension, with a premium tier that adds unlimited aliases and phone number masking. Both services protect your real email address, but they differ significantly in flexibility, pricing, and features.

The Case for Email Alias Services in 2026

The need for email privacy tools grows every year. With 392.5 billion emails sent per day worldwide, your inbox faces constant threats from spam, phishing, and unwanted marketing. Research shows that 46.8% of all email traffic is spam, and the average person receives between 5,000 and 10,000 marketing emails per year. Even more concerning, email addresses appear in 53% of all data breaches, and the average data breach now costs organizations $4.44 million. Email alias services like Email Monster and Firefox Relay let you compartmentalize your online identity so that a breach at one company does not compromise your accounts elsewhere.

Feature Comparison

Pros and Cons

How Do Aliases Work in Email Monster vs Firefox Relay?

Email Monster lets you make up any email address on the spot. You pick a username like "dan" and then use addresses like amazon@dan.eml.monster or nytimes@dan.eml.monster instantly. No browser extension is needed, and there is no pre-creation step. You can use these aliases on any device, in any browser, and even share them verbally because they are human readable and memorable.

Firefox Relay generates random aliases (like x7k2m9@mozmail.com) through its Firefox browser extension. You click a button in a form field and Relay creates a random address for you. On the free plan you are limited to 5 total aliases, which means you can only protect 5 accounts before you need to upgrade. Premium ($1.99/month) gives you unlimited aliases with a custom subdomain, but the addresses are still random and unmemorable.

Browser Independence: A Critical Difference

Email Monster is completely platform and browser independent. It works in Chrome, Safari, Edge, Firefox, Brave, and every other browser. It works on Android phones, iPhones, Windows PCs, Macs, and Linux machines. There is nothing to install. You simply use your alias addresses wherever you need them.

Firefox Relay's core experience is tied to the Firefox browser. The extension that generates aliases only works in Firefox. You can manage existing aliases on the Relay website from any browser, but creating new ones on the fly requires Firefox. This is a significant limitation for users who prefer Chrome, Safari, or other browsers. According to browser market share data, Firefox holds roughly 3% of the global browser market, meaning the vast majority of internet users would need to switch browsers to get the full Firefox Relay experience.

Which Is Cheaper: Email Monster or Firefox Relay?

Email Monster costs $6.99 per year for unlimited everything including newsletter digests. You can also pay monthly at $2.99/month. Firefox Relay Premium costs $1.99 per month ($23.88/year). That makes Email Monster roughly 71% cheaper on an annual basis. Firefox Relay's free tier only allows 5 aliases total, while Email Monster's free tier allows unlimited aliases with up to 40 forwarded emails per month. For users who want the most value for their money, Email Monster is the clear winner.

Does Firefox Relay Offer Newsletter Digest Like Email Monster?

No. Firefox Relay does not have a newsletter digest feature. All forwarded emails arrive individually as they are sent. Email Monster is the only email alias service that collects newsletters and delivers them as a single bundled email on a weekly or monthly schedule. With the average person receiving between 5,000 and 10,000 marketing emails per year, this digest feature can save significant time and reduce inbox distraction.

Phone Number Masking: Firefox Relay's Unique Feature

Firefox Relay Premium includes phone number masking, which gives you a masked phone number that forwards calls and texts to your real number. This is a feature Email Monster does not offer. If you frequently give out your phone number and want the same kind of privacy protection for calls and texts, Firefox Relay Premium provides this capability. However, it comes at a significantly higher annual cost ($23.88/year) compared to Email Monster ($6.99/year), and Firefox Relay still lacks newsletter digest bundling, custom alias names, and browser independence.

Which Is Better for Privacy?

Both services protect your real email address from senders. Mozilla has a strong reputation for privacy and has been advocating for internet user rights for decades. Firefox Relay Premium also offers phone number masking, which adds another layer of privacy protection. However, Email Monster gives you more control over your email privacy with on the fly customizable aliases, one click blocking, and the ability to detect data leaks by giving each service a unique, identifiable address.

With email addresses appearing in 53% of all data breaches, the ability to quickly identify and block a compromised alias is crucial. Email Monster's readable alias names (like linkedin@dan.eml.monster) make it immediately obvious which service was breached. Firefox Relay's random strings require you to look up the alias in your dashboard to figure out where it was used.

Free Tier Comparison: 5 Aliases vs Unlimited

The free tier gap between these two services is enormous. Firefox Relay gives you just 5 aliases for free, which means you can only protect 5 websites or services before hitting the limit. If you sign up for more than 5 services (and most people sign up for dozens), you are forced to either reuse aliases (which defeats the purpose) or upgrade to the paid plan. Email Monster's free tier offers unlimited aliases with a cap of 40 forwarded emails per month, giving you true compartmentalization across all your accounts without paying anything.

Frequently Asked Questions