I've been using an extension called TabWrangler for years–it automatically closes tabs you haven't looked at (or pinned) for a specified period of time. The cl

I've been using an extension called TabWrangler for years–it automatically closes tabs you haven't looked at (or pinned) for a specified period of time. The closed tabs are saved in a searchable list so if something actually important gets closed you can find it again, but I find that 99% of the time I don't even notice that it has auto-closed hundreds of tabs I've opened over the course of the day. I think I used to tell myself that leaving tabs open was sort of a 'soft bookmark', but now I just bookmark stuff that I genuinely want to come back to, and let the rest of the unimportant stuff I stumble across just disappear.