Firefox has gone full retard ever since it started chasing version numbers
I would still recommend Firefox over that monstrosity known as Microsoft Edge.
If you like Firefox but don't want the official version, try Pale Moon, an excellent forked version of Firefox.
If you want Mozilla nostalgia: Seamonkey.
Good browsers based on Chromium: Opera, Advanced Chrome, Yandex.
New kid on the block: Vivaldi.
Windows Safari is inferior to OSX Safari, so I'm not inclined to recommend Safari for Windows users.