I've had times where my tabs were so numerous they were thumb wide, I us Opera though, it's got a little list you can drop down of every tab you've closed as an automatic feature (plus built in email client, best browser I've ever used) so popping them back up is never a problem, it's bringing myself to shut them in the first place. It's like spring cleaning your attic where you end up getting distracted for hours at a time by some old paperbook, comic book, photo album, knick-knack, trophy, or other widget. At least with wikipedia I can usually break orbit in under an hour