MeasureIt - Плагин Mozilla который позволяет рисовать линейку в любом месте веб-страницы.
  19 KB | Mac OS X | Freeware

MeasureIt allows you to draw a ruler across any webpage to check the width, height, or alignment of page elements in pixels.

Draw out a ruler to get the pixel width and height of any elements on a webpage.

Here are some key features of "MeasureIt":

· click the MeasureIt button MeasureIt icon in the status bar or toolbar to turn it on/off
· click and drag out a ruler box
· click and hold to move the ruler box
· CTRL + Arrow Keys to nudge ruler by 1 pixel
· CTRL + SHIFT + Arrow Keys to nudge ruler by 5 pixels
· click the "X" to close that ruler or click outside of it to begin drawing another ruler
· ESC key to turn off MeasureIt


Requirements:

· Firefox: 1.0 or later