To try the thousands of add-ons available here, download Mozilla Firefox, a fast, free way to surf the Web!Close
Choose from thousands of extra features and styles to make Firefox your own.Close
|User since||March 23, 2012|
|Number of add-ons developed||1 add-on|
|Average rating of developer's add-ons||Rated 3 out of 5 stars|
Browser pixel rulers to help inspect window widths of adaptive designs. The add-on button acts as a toggle that adds rulers similar to a graphics app to measure the current window resolution.
This add-on is not compatible with your version of Firefox because of the following:
No add-on reviews yet.