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First off, Mozilla believes in the service. Mozilla itself gets funding from donations and corporate backing (I think). The cost of bandwidth is small compared to other file share sites in that the files stored are temporary. The transient nature of the files means that the max storage space needed is relative to the concurrent number of users. Bandwidth also. That means sans a very clever DDoS their expenses should be manageable compared to say Google Drive, Dropbox, or MS One Drive.

I remember sending a signed PDF via Firefox Send and was at first horrified when I realized I couldn't get the file back after 24 hours but then relieved knowing that the recipient got it and then it disappeared from the internet. Very cool!

I believe that most of Mozilla's revenue comes from Google profit-sharing, because they make it the default search engine.

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