Some will know this already, I only just found out about it - by accident nogal. 
In Firefox 3 and IE 7 you can press Control and a number to activate that tab. So if google is in the first tab and MYBB in the second tab, pressing Ctrl+1 will activate the google tab and Ctrl+2 will activate the MYBB tab.
In Firefox 3 and IE 7 you can press Control and a number to activate that tab. So if google is in the first tab and MYBB in the second tab, pressing Ctrl+1 will activate the google tab and Ctrl+2 will activate the MYBB tab.