Re:Standards and Bueller, both missing. (Score 1)

Now click Edit -> Extensions and select an extension. Right click and "Visit Home Page". Assuming you don't have an extension to prevent this, you just opened a new window. The same occurs with the themes listing and the "Get more extensions/themes" links.

Touché. And to be honest, I didn't really notice that. But I have to add that I think the reason it wasn't that noticeable to me is that it's pretty minor in the scheme of things. I click dozens of links that are forced to open in FF tabs every day, but I might go looking for a new extension or theme once every couple of months. So I'll concede your point but it seems like a minor thing, and while ideally it should be built in, it is easily extensible to have the desired behavior. Fair? :)