User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.7.3) Gecko/20041026 Firefox/1.0RC1 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.7.3) Gecko/20041026 Firefox/1.0RC1 In 1.0RC1 there's options regarding tabbed browsing. These options replaces SingleWindow plugin functionality. I'm using option "Force links that opens in new window to open in NEW TABS". This option is forcing PopUps to open as tabs, but this is incorrect. PopUps should remain popups, I can't work with some sites due to this behaviour. The good-old SingleWindow plugin worked perfectly for me. Reproducible: Always Steps to Reproduce: 1. 2. 3.
Also, this option ignores setting to open new tabs in background.
If you were to have this feature, it would need to be user-selectable I think because one of the main attractiveness points with Firefox is that you can browse completely using one window using tabs. To break this pattern could open Firefox up to the same problems as occur frequently in IE where seemingly unlimited popups can be opened by certain unscrupulous websites.
There is a pref for that. In future please search and use support forums first. http://www.mozilla.org/support/firefox/tips#beh_newwindows