8 months after the first, three star rating:
the add-on has been improved, is now much more stable and works well. Protects the privacy and saves loads of time. There are still sites where the settings need to be updated manually, but not too many and I'm not letting perfect be the enemy of good.
The "old" review: Good idea, but unstable implementation. Some pages hang (e.g. connect.garmin.com, with trust arc), with no way of cancelling the process, the only way is to disable the CoM. There seems to be an option to not run the CoM on a page (a check box "keep running on this site?") but it does not affect the process in any way.
Please fix it and/or provide some way of giving you feedback and learning about fixes.