Rated 4 out of 5 stars

I really like this addon. It does take some time to get permissions set up, but it's worth the effort.

Unfortunately I had to disable it because of an incompatibility with the Update Scanner addon that I rely on. However, the developer has it on his bug list, so once he gets that resolved I plan to turn it back on.

This review is for a previous version of the add-on (0.5.18.1-signed.1-signed). 

There has been a recent improvement in the conflict between Update Scanner and RequestPolicy. As of RequestPolicy version 0.5.17, when you click a link from an Update Scanner webpage version/diff the link click is allowed instead of being blocked.

The major remaining conflict with Update Scanner, the blocking of cross-site requests for additional content requested by a webpage version/diff, can be worked around by allowing all requests from the origin "about:blank". This does mean that sites can intentionally bypass RequestPolicy, however you'll get the privacy/security benefits of RequestPolicy in most cases. I still hope to figure out a better solution.