|Initial release||12 March 2019|
|Type||Secure file sharing|
|License||Mozilla Public License 2.0|
Firefox Send was a free and open-source end-to-end encrypted file sharing web service developed by Mozilla. It was launched on March 12, 2019 and was taken offline on July 7, 2020 after the discovery that it was used to spread malware and spear phishing attacks. The shut down was made permanent on September 17, 2020, following employee lay-offs in August that likely included the staff who would have been responsible for implementing abuse prevention and malware reporting mechanisms.
Firefox Send allowed users to upload computer files, including large files up to 2.5 gigabytes, to the Send website, generating links from which the file could be accessed and downloaded. Users could also set expiration dates or maximum number of downloads for the links.
The service was end-to-end encrypted, meaning only the uploader and those who the links are shared with can view the file.
In August 2017, Mozilla launched Firefox Send via its Test Pilot program. The developers wanted to experiment with end-to-end encrypted data synching and this service allowed them to try out encrypting large files, gigabytes in size, as opposed to the megabytes usually synched by browsers.
Firefox Send was launched to the public on March 12, 2019. On July 7, 2020, the service was suspended because absence of any form of authentication and abuse reporting mechanisms attracted cybercriminals who used it to send malware and mount spear phishing attacks. The suspension was supposed to be temporary and should have lasted only as long as necessary to implement mandatory authentication via Firefox Account for file uploading and mechanisms for reporting previously uploaded malware.
On September 17, 2020, as a part of Mozilla's business and products refocusing plans, the service was shut down permanently, along with Firefox Notes.