That is true currently. Know that this problem will be strongly reduced in the next version of Firefox, to be released on October 22nd. Firefox will use much l

That is true currently. Know that this problem will be strongly reduced in the next version of Firefox, to be released on October 22nd. Firefox will use much less power then, on par with Chrome (haven't seen direct comparisons to Safari). Unfortunately by the time it's released Catalina will be out for a month already.