The firefox awesome bar has an awesome (haha) feature for that: if you type an address, it will detect wether you have matching tabs open and give you the optio

The firefox awesome bar has an awesome (haha) feature for that: if you type an address, it will detect wether you have matching tabs open and give you the option to switch instead. It works over multiple tab groups and windows. So: locating a tab is quicker and it keeps the state of the page.