Sometimes I'd like to open a link in a new browser window. If I'm inside a browser I can hold down (generally) shift when I click the link, and a new window will be opened. However, Choosy doesn't seem to expose a way to do this.

I think this can be implemented without interfering with the existing modifiers feature, by having the behavior change occur once the popup is already open. Because not all browsers would support this, it could probably be signposted by changing the label on supported-browsers to e.g. "Firefox (new window)" once the modifier is pressed.

Firefox and Chrome both require a command line parameter to trigger this behavior: --new-window

I'm not certain how to do this with Safari.