Firefox Browser Add-ons
  • Extensions
  • Themes
    • for Firefox
    • Dictionaries & Language Packs
    • Other Browser Sites
    • Add-ons for Android
Log in
Preview of MailFlash — Instant Email

MailFlash — Instant Email by NetRunners S.L

Protect your inbox from spam. Generate temporary email addresses instantly with built-in inbox and real-time notifications.

0 (0 reviews)0 (0 reviews)
Download Firefox and get the extension
Download file

Extension Metadata

About this extension
Generate disposable email addresses with one click. Receive real emails without ever exposing your personal address.

Tired of spam after signing up to any site? MailFlash is the fastest, cleanest way to protect your main inbox.
  • One-click generation — random temporary email instantly
  • Built-in inbox — read messages directly in the extension
  • Automatic notifications — get alerted the moment an email arrives
  • 1-hour duration — long enough for any verification
  • Real, functional emails powered by the Mail.tm API
  • No signup, no tracking, no ads
  • 6 languages — English, Spanish, French, German, Italian, Portuguese
  • Auto language detection with manual override


MailFlash does NOT collect personal data. Everything is stored locally in your browser and automatically deleted when the email expires (1 hour).
  • Signing up to websites without compromising your real email
  • Downloading ebooks or resources that require an address
  • Testing services without commitment
  • Quick email verifications
  • Protecting your main inbox from spam
  1. Click the MailFlash icon in your toolbar
  2. Hit "Generate temporary email"
  3. Copy the address with a single click
  4. Paste it wherever you need
  5. Receive incoming messages directly in the extension

Developed by NetRunners S.L. with a privacy-first approach.
Rated 0 by 0 reviewers
Log in to rate this extension
There are no ratings yet

Star rating saved

5
0
4
0
3
0
2
0
1
0
No reviews yet
Permissions and data

Required permissions:

  • Input data to the clipboard
  • Display notifications to you

Optional permissions:

  • Access your data for api.mail.tm

Data collection:

  • The developer says this extension doesn't require data collection.
Learn more
More information
Add-on Links
  • Copy add-on ID
Version
1.1.0
Size
33.02 KB
Last updated
4 days ago (Jun 28, 2026)
Related Categories
  • Privacy & Security
  • Social & Communication
License
MIT License
Privacy Policy
Read the privacy policy for this add-on
Version History
  • See all versions
Add to collection
Report this add-on
Go to Mozilla's homepage

Add-ons

  • About
  • Firefox Add-ons Blog
  • Extension Workshop
  • Developer Hub
  • Developer Policies
  • Community Blog
  • Forum
  • Report a bug
  • Review Guide

Download

  • Download Firefox
  • Windows
  • macOS
  • iOS
  • Android
  • Linux
  • All

Latest Builds

  • Nightly
  • Beta

Firefox for Business

  • Enterprise

Community

  • Connect
  • Contribute
  • Developer

Follow

  • Instagram
  • YouTube
  • TikTok
  • Bluesky
  • Podcast
  • Privacy
  • Cookies
  • Legal

Except where otherwise noted, content on this site is licensed under the Creative Commons Attribution Share-Alike License v3.0 or any later version.