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Ruler Bar
This appends a ruler to the mail composition window...
thunderbird extension ruler mail thunderbird Thunderbird ruler
Gnome Screen Ruler
Gnome Screen Ruler is a customizable screen ruler for Gnome....
screen ruler screen ruler GNOME measuring horizontal distances
PixelWindow
Measure things on your screen...
pixDIF
An utility for designers and developers to help them see and measure differences between design comps and design implementations...
image ruler measure images design comps design implementations