The way I deal with information sprawl (lots of stuff I want to read, but I can't right now) is to move it to a Reading List where I can prioritize and archive each entry as I read them. For me, tabs are things I need right now; I close them when I'm done with them.

I usually don't have any tabs left when I'm done with the day and usually don't exceed more than ten tabs.

My main browser is Safari, but when I use Firefox (on my work machine) I also use tab-less and Amethyst to have all of my pages on my screen. This way, I'm more aggressive about only keeping what I need and closing what I don't.