Ruler

mouse to your the want 3.width,
grid and pixels
can use add
at of right shape in measure the on height, the dimensions 1.click and ruler 2.click with
top
left, you displayed your icon which to the on ruler mouse the extension.
bottom add webpage. is the the on page.
webpage on screen the measure to of a to drag anything webpage right, the the the by clicking/dragging.
shapes on top dimensions and click ruler. to see ruler start/stop 2. draw features
on 1. you use
lines. corner how