Firefox let's me keep the tabs on standby. They don't take memory and only load when I click on them. Also I use vertical tabs using Sideberry extension. So it is easy to manage a huge amount of tabs.
Tridactyl also gets unusable.
I finally cleared all the tabs out last week and started over, because it was clear my "reading list" was simply never getting read, ever. There were tabs from February still in there, never read.