Life-o is a firefox extension that will reorder your tabs when you click to open a link in a new tab (usually middle click). Normally, your new tab will be added to the end of your list of tabs. This extension will open the page in a new tab directly after the tab you are currently in. That way, the information you want to look up will be at the next tab you want to open.
These details are provided for information only. No information here is legal advice and should not be used as such.