Last year, Mozilla announced plans to phase out integrated FTP implementation in your browser. After Chrome, Firefox would stop supporting this technology as of June 2020, although finally the execution of the decision was not carried out due to the pandemic. Up to now.
The protocol for transferring files from a host to another, especially popular a few years ago and which is still used today to upload files to web hosts, for example, it will finally be no longer supported in the Mozilla browser with the arrival of Firefox 90 in a week.