Being a pc user for so long I have yet to fully adjust to how mac os closes apps, well someone in my home called my attention, & in a rush I just clicked on the red x at the top left, forgetting that one has to select quit to close an app. I came back to my laptop, to see the Firefox icon on my dock still highlighted, so I know I did not exit it properly. Will this have caused any harm? or exposed me to viruses?