I usually have a lot of tabs open. Not as much as Brian Karas who has like 50+.... but still a lot.
It's a common thing as one finds pages of interest, opens them and switches back over time.
I recently found a Chrome / FF extension, OneTab, that solved that, its pitch (which I found accurate) below:
You can effectively sweep all pages to a list and then as your pages grow again, sweep new ones into that list. Likewise, as you work down, you can switch back to the list and open up ones you want to review. I find it very helpful.
Anyone with other options or other suggestions or feedback on this, please share.