> well-managed environment (ie one that has non-rudimentary window management and a browser/extension that handles idle tabs with negligible ongoing resource use).

Can you elaborate on this? Which extensions are you talking about?

I also rack up hundreds of tabs and my browser is often the main resource hog for me. I’ll often have to kill -9 it to force it to start with “oops we crashed, here are your previous tabs in an unloaded state”, but it sounds like you have a better way of doing this