I use a few browsers: Opera for when running my laptop on battery Vivaldi when in the office. Now, I've ditched Vivaldi and sticking with Opera & Firefox. I

I use a few browsers: Opera for when running my laptop on battery Vivaldi when in the office. Now, I've ditched Vivaldi and sticking with Opera & Firefox. I suspect someone will create a Firefox Addon to auto-detect we running on batteries and throttle back on the performance settings.