There’s so little useful information on the matter so I’ve decided to post about it. And the default option under Preferences -> Tabs called “Open new windows in a new tab instead” does not work. I have no idea why, and I’m embarrassed on behalf of Mozilla that it doesn’t. However here’s how you fix it.

This is what you have to do to have Firefox 4 open your links in a new tab instead of a new window.

1. In your URL bar enter “about:config”.
2. Accept the prompt.
3. Search up the line

browser.link.open_newwindow.restriction

4. Change the default value “2″ to “0″.

Once you’ve set it to “0″ it will immediately work.

Further refrence can be found here http://kb.mozillazine.org/About:config_entries

// CrashMAG