Actually we have those main browsers (lucky the era of IE predominance is history)
Firefox: opensource but allow drm 
librewolf: firefox fork, focus on security
icecat: ex Icewheasel, focus on libre/free components
Waterfox: as I seen is a clone of firefox
In your opinion which is the best to use? Iām interested in privacy e non drm stuff.
Librewolf, icecat or IE emulated by wine 
?