@Luc_Maximilien i would suggest you the free and opensource https://filezilla-project.org/
please take also in consideration that a browser could be extended to do one million things, but be slow and instable, or be somehow smarter, faster and more stable… lot’s of people blame the new WebExtensions but should also think that the Firefox as it was could have died in a few years!
you are free to use v56 but don’t expect the best web experience in the near future.
ciao!