I need help
If everything else is off or too small as well it may be you accidentally have the screen zoomed out. Try holding down the CTRL button and use the mouse wheel to scroll/zoom in. If the photos in question are in a photo album on Facebook (small pics on left side of the page) Just click on one to open the photo album into a larger view. Then you may be able to right click the photo and save to your computer for safe keeping or printing.