The files were encrypted, Mozilla didn't have access to the contents.
Which is, of course, exactly why they couldn't use any of the normal methods of dealing with malware.
Technically, there are ways of scanning files without necessarily having access to them [1], but they're not production-ready yet.
[1]: https://blog.cryptographyengineering.com/2019/12/08/on-clien...
Re:What happened to Firefox Send?
by pseudalopex on Friday September 18, 2020 @03:36PM
(#24521025)
Non profit companies still have expenses.
Mozilla Corporation is a for profit subsidiary of the non profit Mozilla Foundation, technically.
And couldn't they have added a malware scanner to deal with the problem directly?
As for illegal content that's true with any private communication but maybe DCMA or similar got involved. I can accept that fighting for private large file transfer detracts from the main goal.