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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
Pixel
Pixel is a RGB, CMYK and HDR image editing, photo retouching and manipulating....
Pixel OldSchool
A dark and flat theme for your GNOME desktop...
Pixel Perfect
Make your web development Pixel Perfect...
Gimp::Pixel
Gimp::Pixel is a how to operate on raw pixels....