I have a number of web applications that I need to use for work that have a tendency to use a lot of CPU and memory. When using Firefox as my default browser (which is my preference), my CPU was running hot almost all the time.

I had started using MS Edge, since it background sleeps idle tabs. However, I was not happy with this arrangement as Edge is "yet another Chromium browser", and is not overly respectful of my privacy.

Now with Auto Tab Discard, my idle tabs have been powered down and my CPU is cool and quiet. For me, this extension has saved Firefox. This functionality should be part of the core product!