Converted another person to use tabbed browsing

Walking by the cubicle of a collegue, noticed he's using Mozilla Firefox. I congratulated him, but expressed surprise he's still got too many buttons on the taskbar. Guy's excitement has been totally genuine when he learned how to browse all he wants from a single window, but in different tabs. I left from work happier than usually. But now, what are poor web developers to do? See, for people opening new browser windows it is expected that the current website is not going away, so a new window should open. But for those using tabs, it's a mere annoyance. If I click on a link, I expect it to always open in the same window!