I use Firefox mainly, cos I love the added customizability of it. I'll occasionally jump over to Chrome, but I'll make sure that both browsers are similar in customization before doing anything. My favorite addons for FF: Combine 'Google Shortcuts' with 'Vertical Toolbar', and you get a vertical speed dial, giving your browser a bit more headroom by freeing up the few pixels of space the bookmarks toolbar takes up. I think you get a bunch of extra icons to drag around with the Vertical Toolbar, and G Shortcuts can go either vertical or horizontal, so both addons have their bonuses. My other favorite is a bit of a passive one: 'Movable Firefox Button' so you can get more tab space at the top left by dragging it somewhere like the far right of the address/search bar. Vertical speed dial and Movable FF button in action: