To be fair, this is probably Firefox's fault. But it might not be.
I have one Firefox window open, and as many tabs as I need. I'm diametrically opposed to JWZ on this. And I have all links, except from the address bar or the del.icio.us sidebar (and I can't work out how to make that one cooperate) or that are within the same website, open in new tabs. All of them. Bookmarks from menu or sidebar or toolbar: New tab. Websites external to the one I'm on: New tab. Links opened from external programs: New tab.
But Google doesn't cooperate. It hasn't always been like this, and I'm not sure who changed what, but links from a Google search open in that tab. Unless I middle-click, which means open here. But then a link might be going to open in a new tab instead, which means they will now open in the same tab, which is what I didn't want. Or look! A Google preference to open all links in a new page! No, sorry, doesn't work: They all open in the same new tab.
This is getting quietly but persistently fucking infuriating. And it happens on both my XP box at work and my Linux box at home, and not all behaviours do that. So I'm blaming Google until informed otherwise.