Until a few days ago, Firefox on my computer always opened as a new window when I clicked on the icon at the bottom of the taskbar. But then suddenly something happened; the icon went "white" and I had to first remove it and then put it back in the taskbar. Now Firefox does not open in the same way anymore. To be able to open a new window, you must right-click and select "open in new window". Previously, the "opening of a new window" happened automatically when I clicked on the icon. How do I get the old "opening" back, which I think is better?