Thanks to Preferences dialogue regression in Firefox 2.0, the option to force all links that would open in a new window to open in tabs instead disappeared. Which is pretty stupid.
Just wiped out my old, bloated Firefox profile on my Kubuntu desktop here and suddenly, horror of horrors, it starts opening new windows instead of new tabs. I can’t use the Preferences dialogue, so…
browser.link.open_newwindow in about:config needs to be set to 3. Someone should make an extension which can change all these preferences that didn’t make the cut to 2.x from the GUI.
All fixed now.