I remember being able to fix this before, but I can't find the config category for it now. Basically, no matter what is already open in other tabs, I always want Firefox to follow my directions and open whatever website I type in the URL in my current tab. I don't care if, say, Twitter is already open in an earlier tab. If I type in twitter.com, I want it to open in that tab, not switch to the previous tab. For example, there may be some sites that update regularly, but I want to hang onto the older version for a bit, so I leave it open. But then if I want to see the newer updated page, Firefox will not allow me to do it. What do I have to search for to switch to True or False to change this?