Excellent! Unlike the other similar add-ons, this one seems to retain the cached websites and automatically apply the saved setting. As a suggestion for improvement, any chances to add some sort of UI to see/edit cached (saved) websites? Also an export/import option would be fantastic.

Lastly, I would also suggest swapping the icon colors to show "red" when RFP is actually disabled (privacy compromised) and "green" when RFP is actually enabled (privacy protected). Alternatively, an On/Off button might also alleviate confusion.