[coderunner]

Is there a cheaper S3 alternative that you recommend or that Mozilla's likely using instead?

[Rebelgecko]

I think Backblaze's cloud storage is the cheapest I've seen. Microsoft and Google would also be a bit cheaper than S3

[toomuchtodo]

As you mentioned, huge fan of Backblaze B2. No affiliation, just a satisfied customer. Can also pair it with Cloudflare for even less expensive traffic serving.

https://www.backblaze.com/blog/backblaze-and-cloudflare-part...

[ibotty]

But it's not s3 compatible.