Searching through the adress-bar opens new Tab.

A few moths ago, when you visited a website and then typed some new search-term in the address-bar, you used to be able to search right in that tab. Now a new tab opens up and you get moved there. While programming, i search for a lot of stuff. Switch to Firefox -> Ctrl+L -> type search-term is the fastest way i found to search for whatever I need. Problem is: now my browser clutters itself by always opening new tabs instead of just reusing the one i don't need anymore. So my questions would be this: # Is it possible to restore the old behaviour of staying within your one tab? # If there is some other shortcut that allows for searching without moving to a new tab? (I also tried Ctrl+K and Ctrl+J. Both still open a tab when you already are on a website.)