**TL; DR: Although well-intentioned, the way this extension works enables Echo Chambers and Censorship to thrive, and may go against the idea of a "Healthy Internet"; but at least it's open source.**

Positives: At least I can find a plus on the Open Source...

Negatives: Having read all the Instructions and Privacy Notice, analyzing it through my personal lens on Censorship and Echo Chambers, and using it for a little while, I can safely say this could be a tool for censorship and echo chambers. (Suggestions will be sent later to Mozilla.)
This is specially worrying given the bottom disclaimer on the RReporter page:

"This is part of a broader movement for a healthy internet."