Re:Firefox 57.0 Released
by steveklabnik on Tuesday November 14, 2017 @10:11AM
(#15695653)
Sounds like you should definitely file a bug.
there is one: https://bugzilla.mozilla.org/show_bug.cgi?id=1404042 — it was moved to being tracked for v58.
Apparently "vibrance" is one of the culprits and switching to the light or dark themes can help a lot. But yes, it's destroying battery compared to Safari for me. Which is a shame, as it's already my default on Windows.