I get lost in my browser tabs all the time. The place I most often want to go is back to the tab I was just in. On Firefox, there are a few utilities that let me do that. My nephew Joel Weinberger has written one that does that and nothing but that for Chrome. You can grab it (free, of course) here. (The source code is on github.)
Joel wrote this, as the result of my whining, during our annual post-Thanksgiving-dinner viewing of Jurassic Park, although he did some clean up of the code afterwards. I should add that, among other things, Joel is a certified computer genius working in deep areas of computer security.