Very useful addon, but one feature is REALLY missing. Rated 4 out of 5 stars
I find it tedious to impossible sometimes to block ads or other unwanted content because it's just impossible to determine how to block single objects.
So what I'd REALLY appreciate would be a context menu option like "block this element", maybe with a dialog where I can refine the filter. That would make working with uMatrix a ton easier.
Apart from that, uMatrix is great and in my opinion an absolutely essential addon with good usability.