Technically, we now have evidence for three. There is no evidence yet for people with a clean desk but messy tabs ;)

But I'm confident they exist, we should put a bounty on the location of a prime specimen and see what happens when we breed them with the third kind to establish if there is a genetic component to this.

Clean desk but messy tabs here. I like the aesthetics of clean interior design, it’s peaceful and inspiring like a blank whiteboard. Also, nobody can see my tabs.

My girlfriend will stop and clean the house if she sees a crumb, but I don’t think she knows she can close tabs. She probably has a tab for everything she’s ever looked at on the internet. They never go away. It’s as overwhelming to me as my inability to spot a crumb is to her.