OneTab, a free Chrome add-in, converts a set of browser tabs into a page of links, then restores the tabs when required. It can instantly free up gigabytes of memory when you need it for something else.
OneTab allows me to continue hoarding tabs, but also make sure they aren't causing my browser to come to a standstill or get over-cluttered. When I send a group of tabs to OneTab, I try to make sure they represent a project or task I'm trying to accomplish instead of just blasting everything away. This makes it really easy to pick up a project if it comes back to the forefront of my tasks. Otherwise, if it ages there too long, I just get rid of the whole group.
As a chronic die hard multiple tabs opener, Onetab litteraly made my browser usage livable.
It saved me several times, having hundreds and hundreds of tabs open and can't be simply closed.
I use it daily.