Same here. Cannt use it on my mba 2012. It just to heavy on resources. Chrome handles it without more loosely.
Opera also has a battery saving feature.
Tried running Edge for a while, which is gentle on battery, however Edge is just lacking.
However when I develop I always develop for Firefox first, but the Firefox developer tools are starting to age as well.
Has the web standards become so complex that it is inevitable that we will have a Chromium monoculture?
I want to believe, but I heard that multiple times and still can't even open simplest html websites without hearing the pain of my machine.