Shift, Control, Command, 4 is supposed to allow me to take a screen shot, but instead Firefox opens another browser window. Then I have to go back to the page that I wanted to take a screen shot on. It is so annoying. It didn't always do this. Seems that it is a new thing that Shift, Control, Command, 4 opens a new page.

How can I take that feature away from Firefox because I always used Command N to get a new browser window, and that still works fine. So why do I have this annoying feature that the shortcut for a screen shot also opens up a new browser window?