The [X] button in the top right corner does wonders for one's productivity. As a bonus, use a different browser for work than you usually do for "surfing". My Firefox is crawling with gadgets that each light up and pulsate with every "must see" action that happens in my extended family of RSS feeds, contacts, and bookmarks. My work browser is a light, crisp little Opera thing that has 10 tabs open all set to to various sub-URLs of http://localhost:8080 :-)