Firefox’s ‘MeasureIt’ is useful and very easy to use.
It places a small ruler icon at the left side of your status bar and when you click on the icon you get a crosshair cursor and your browsing page fades out. MOve over to the desired area or object you want to measure and drag out a box over it – the width and height of the box will be displayed in pixels close to the box. To get out of MeasureIt, use the Escape key and the page reverts back to normal.
Simple. And that suits me fine.
MorganLighter













