All links I click always open in a new tab. I mean, really ALL links, even links which do not use target='_blank" or something like that. I don't press Ctrl key. All was fine until yesterday and I haven't explicitly changed any configuration. I cannot make any update (and I cannot have done any), since it happens on a computer which is not connected to the internet. Maybe there is a configuration I've changed by pressing a conbination of keys unintentionally, but I can't find anything in the configuration about that (about:config). I'm using Firefox 10.0.2 on Linux Mint 12 Thanks for any help.