Sorry about the click bait title, but this is something interesting to me and technically true (until TLS 1.4 rears it's ugly head). Firefox 88 disabled FTP links by default, and FireFox 90 completely removed the ability to access FTP links.
Sure FTP is quite obscure, but for example, an IBM 5110 emulator (the IBM 5100 is the first PC ever released, in 1975, the 5110 was released in 1978 but is mostly the same) is only accessable via FTP for direct download through the authors very old website that hasn't been updated in years.
So TFF can at least load all current TLS connections and FTP, while the latest Firefox can't load any FTP anymore.
Sure FTP is quite obscure, but for example, an IBM 5110 emulator (the IBM 5100 is the first PC ever released, in 1975, the 5110 was released in 1978 but is mostly the same) is only accessable via FTP for direct download through the authors very old website that hasn't been updated in years.
So TFF can at least load all current TLS connections and FTP, while the latest Firefox can't load any FTP anymore.