Sometimes if I'm buying some stuff from Amazon I'll do a ton of research on each one, looking for alternatives, specs, discussions, reviews, etc. Each search can sometimes go up to 40-50 tabs, especially if I'm looking for a specific set of attributes in a product and I just can't find the perfect match. I'll do the searches in parallel and switch between them, so I'll keep everything open since closing and re-opening 50 tabs whenever I want to revisit a session is tedious. Getting to 200 tabs is pretty normal in these situations.