Steps to reproduce: 1. Open new tab: CTRL-T. 2. Type in address bar: "www.google.com". 3. Hit ALT-RETURN. Result: A blank tab is left open. A pretty minor issue but it might be worth changing. It could also be done by automatically closing the blank tab.
Modifying the Return key action with the Alt key is a deliberate decision by the user, indicating that the user wishes to open the url in a new tab. Changing this behavior for blank tabs breaks the consistency of the user interface, which is a key user experience principle.
bug 320989 will fix this.
This is fixed now so I will mark WORKSFORME. Checked with 9.0a1 because I didn't see a latest mozilla central. Mozilla/5.0 (X11; Linux i686; rv:6.0.2) Gecko/20100101 Firefox/6.0.2 Mozilla/5.0 (X11; Linux i686; rv:9.0a1) Gecko/20110911 Firefox/9.0a1