Shoutbox

Firefox, like Mozilla Navigator, has a number of shortcuts that make the use of tabs slicker and more professional.
- Middle-click a link to open it in a new tab
- Middle-click a tab to close it, or press Ctrl+W
- Ctrl+Tab and Ctrl+Shift+Tab cycle through them like Alt+Tab does for windows

And, if you get the Mouse Guestures plugin, you can set up mouse movements that manipulate tabs too. I've got it set up so if I hold the right button and flick the mouse right then left, it closes the tab.