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Very useful, but beware of incompatibilities Rated 4 out of 5 stars
This add-on is useful for seeing what traffic is being sent and received in Firefox which is quite useful. The only problem I've found so far is that it is completely incompatible with Roboform. Firefox 4 is unusable if both are installed and enabled.This review is for a previous version of the add-on (0.8.8.1-signed).