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|User since||June 5, 2012|
|Number of add-ons developed||0 add-ons|
|Average rating of developer's add-ons||Not yet rated|
This addon overlays a ruler on top of your viewport. It makes it somewhat easy to analyze a site as it crosses multiple breakpoints. The ruler values are a little hard to read, but it does the job. I was hoping the ruler would surround the viewport instead of overlaying on top of it so I can see the entire site (including the portion underneath the ruler).
This app has great promise and I look forward to enhancements.