The biggest change in the Mozilla Firefox 90 release is the deprecation of FTP (File Transfer Protocol) support. Firefox follows in the footsteps of Google Chrome/Chromium, and other web browsers, to no longer allow access to ftp:// links.
Mozilla started deprecating FTP support since Firefox 88, but users were able to re-enable the feature by setting the network.ftp.enabled option from false to true in about:config. But starting with the Firefox 90 release, all FTP code is gone forever and can’t be re-enabled, which means that you’ll have to use a special app to access your FTP sites.
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