You should probably report this as a data breach, since meter data sounds like personal data, and FTP isn't encrypted.
And you aren't using Firefox anyway, it has never supported FTP uploads.
And you aren't using Firefox anyway, it has never supported FTP uploads.
To address your concerns though: meter data is not ingested via FTP. That's done using other protocols. It's transferred b2b via FTP over private tunnels. And you're correct Firefox is not used for uploading data. If it were possible it wouldn't even be a good choice given the volume of data we deal with. It is, however, used heavily for accessing the uploaded data by Operations and other teams.