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Firefox Send - Transfer Big Data!
Security Awareness

Firefox Send - Transfer Big Data!

Firefox Send: securely transfer big files - the encrypted alternative to USB sticks for remote teams.

Chris Wojzechowski Managing Director
Updated: October 9, 2024 2 min read read
IT-Grundschutz-Praktiker (TÜV) IT Risk Manager (DGI) § 8a BSIG Prüfverfahrenskompetenz Ausbilderprüfung (IHK) T.I.S.P. Board-Mitglied

TL;DR

Firefox Send is a Mozilla open-source file transfer service that encrypts uploads end-to-end. Files can be set to self-destruct after a configurable number of downloads (1, 10, or 100) or after a time limit (as short as 5 minutes). Password protection adds an additional access control layer. Mozilla recommended it even for financial documents, though independent verification of its encryption claims was still pending at publication time. The service is usable from any browser, not just Firefox.

Table of Contents (2 sections)

They exist - the situations in which large files have to be transferred. In the office you can still help yourself with USB sticks. From a distance you can now use another service: Firefox Send! The Open Source Browser service can be used by any browser. The service should encrypt the uploaded data end-to-end and offers manageable, but useful, additional functions.

Now Firefox mixes with big data to transfer!

Basically, the technology is nothing new: uploading data so that it can be downloaded again by others. For some services, such as weTransfer.com, the transfer of large data is a business model. Firefox Send a project which was developed under the test pilot flag of Mozilla, encrypts the data however. End-to-end even. A feature most services do without. Not at all unimportant. Mozilla even recommends to use the service for financial documents. Whether the data is really encrypted end-to-end at the end of the day has yet to be determined. Until then we recommend not to transfer any sensitive data.

Transfer large amounts of data - with volume or time limit!

A file should only be downloaded once, 10x or 100x? Firefox Send is quite good for this. Especially with giveaways, eBooks or slides for a presentation, downloads can be regulated so well. [caption id=""" align="aligncenter" width="2500"]Transfer large data - and limit the number of possible downloads. Downloads can be limited with Firefox Send. This can be useful in some situations! But also the time limitation is possible. A day or a week? It can also be shorter: 5 minutes. You have to be fast! If you want to further secure the uploaded documents - and don't want to make them dependent on who has the download address - you can set a password for the download. Then password and address should be communicated in different ways. The service enjoys a small advance of trust due to its origin. But it still has to prove itself in terms of reliability and encryption. The operation is, as usual for these services, very simple. Who is curious and wants to see how the service works in detail, can watch the following video. If there are news, you can read them here! https://www.youtube.com/watch?v=eRHpEn2eHJA

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About the author

Chris Wojzechowski
Chris Wojzechowski

Managing Director

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Managing Director of AWARE7 GmbH with many years of expertise in information security, penetration testing and IT risk management. Graduate of the Internet Security master's program at Westfälische Hochschule (if(is), Prof. Norbert Pohlmann). Bestselling author with Wiley-VCH and lecturer at the ASW-Akademie. His assessments of cybersecurity and digital sovereignty have appeared in Welt am Sonntag, WDR, Deutschlandfunk and Handelsblatt, among others.

10 Publikationen
  • Einsatz von elektronischer Verschlüsselung - Hemmnisse für die Wirtschaft (2018)
  • Kompass IT-Verschlüsselung - Orientierungshilfen für KMU (2018)
  • IT Security Day 2025 - Live Hacking: KI in der Cybersicherheit (2025)
  • Live Hacking - Credential Stuffing: Finanzrisiken jenseits Ransomware (2025)
  • Keynote: Live Hacking Show - Ein Blick in die Welt der Cyberkriminalität (2025)
  • Analyse von Angriffsflächen bei Shared-Hosting-Anbietern (2024)
  • Gänsehaut garantiert: Die schaurigsten Funde aus dem Leben eines Pentesters (2022)
  • IT Security Zertifizierungen - CISSP, T.I.S.P. & Co (Live-Webinar) (2023)
  • Sicherheitsforum Online-Banking - Live Hacking (2021)
  • Nipster im Netz und das Ende der Kreidezeit (2017)
IT-Grundschutz-Praktiker (TÜV) IT Risk Manager (DGI) § 8a BSIG Prüfverfahrenskompetenz Ausbilderprüfung (IHK) T.I.S.P. Board-Mitglied
Certified ISO 27001ISO 9001AZAV

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