I've used Total Suspender on Firefox for a few years now. It has whitelist/blacklist, ignore pinned and sound playing tabs. Works great for the most part. It is

I've used Total Suspender on Firefox for a few years now. It has whitelist/blacklist, ignore pinned and sound playing tabs. Works great for the most part. It is a bit annoying that youtube vids lose the timestamp, but youtube is a massive hog so it is a worthwhile tradeoff.