The Firefox Send idea, still running

Firefox Send was a favourite for a reason: encrypted, link-based file sharing with the key in the URL fragment. Mozilla shut it down in 2020. ShieldFive Send follows the same design — encryption in the browser, key in the fragment, expiring links — and it’s maintained.

Send files encrypted

The cryptographic core is open source (@shieldfive/crypto), so the property people liked about Firefox Send — being able to check how the encryption works — still holds.

The same design, deliberately

Encrypt in the browser, put the key in the fragment after the “#”, hand over a link. Browsers never transmit that fragment, so the server holds ciphertext it has no way to open — the property that made Firefox Send worth using.

Still readable source

Transfers are sealed with a random key under XChaCha20-Poly1305 via the open-source @shieldfive/crypto core. If what you valued about Firefox Send was being able to check the claim yourself, that part is unchanged.

Expiry and download caps, on purpose

Firefox Send was retired in 2020 after abuse problems. Every transfer here carries an expiry and a download limit, with rate limits behind them, and expired ciphertext is queued for deletion.

No account to resurrect

Send a transfer with no signup and no email address, exactly as before. Signing in is optional and only adds history and higher limits — this time attached to a maintained product rather than a standalone experiment.

Send a file in seconds

Drop it, share the link, and it’s encrypted before it leaves your device — no account required.

Send files encrypted

Questions

Is this the same encryption model as Firefox Send?
The model is the same in spirit: the file is encrypted client-side and the key travels in the link fragment, so the server never sees it. Send uses XChaCha20-Poly1305 via the open-source @shieldfive/crypto library.
Why did Firefox Send shut down, and will this?
Mozilla retired Firefox Send in 2020 after abuse issues. ShieldFive Send applies rate limits, expiry, and download caps, and is part of a maintained product rather than a standalone experiment.