- harviewer 544 HAR Viewer is a web application that allows visualizing HTTP Archive logs (HARs)
- ccdump 20 Display the graph created by cycle collector.
- PixelPerfect 18 Firefox/Firebug extension that allows web developers and designers to easily overlay a web composition over top of the developed HTML
- prototypes 6
- firebug 3 The Firefox Firebug you have known and loved