If you want to make a screenshot of a website that works well in print or on a high-DPI screen (like Apple Retina displays), here is how you can capture a high-resolution screenshot.
You can do this without an addon:
CTRL +
and CTRL -
so it covers most of the window area. Leave a little padding on the left and right so it looks good.CTRL SHIFT M
)CTRL SHIFT J
)CTRL SHIFT P
)