Wonderful idea with some performance issues Rated 3 out of 5 stars

This tool was exactly what I was looking for when trying to troubleshoot some issues with our proxy server.
However, it easily causes Firefox to use up 100% of one of my CPU cores and makes Firefox fail to respond for seconds at a time.
For example, try visiting www.marketwatch.com which is pretty JavaScript heavy and watch your processors go wild.
I think this tool still has a place but anyone using it should be careful to create filters before hitting an active page.

This review is for a previous version of the add-on (1.5.4).