Firefox: Open new window in new tab

How to force open new window to new tab in Firefox 2.0?

Open location
about:config

Set Filter
browser.link.open

Variables:
browser.link.open_external
Rule for opening links from external programs (e.g. Thunderbird, Psi, ...)
browser.link.open_newwindow
Rule for opening links targeted to new window by the 'target' attribute
browser.link.open_newwindow.restriction
Rule for opening restrictions by Javascript

Values:
The value sets opening links in:
1 current tab
2 new window
3 new tab in current window