Possible Duplicate:
Can I change the behavior of my firefox shortcut on the Windows 7 taskbar?
How to adjust Firefox for opening new tab (NOT new window) with Shift+LeftMouseClick on link in current tab?
I know that Ctrl+click made such thing, or MiddleMouseButton click, but I need exactly Shift+LeftMouseClick, because I just did this Shift+click for million times in Opera and this combination is now a reflex.
Any plugins or settings or advises how to made such adjustment?