Yes, I still use it and can confirm that I have had no concerns or problems with it. On the other hand, if I had to reinstall, without research, I'm not sure how I would reinstall it. Having alternatives is a good thing.
I have had frequent enough issues with it silently blocking some things with no ui exposure of those blocks. Been a while now, but I think it was stuff like webrtc and other more "arcane" features.
Indeed, this is why I eventually stopped using it; sometimes a random site wouldn't function properly, and took time to figure out it was uMatrix. It was a nice plugin indeed though.
Yeah true, but I had many sites that I manually white-listed scripts / external resources, and was succesfully using those sites. But then some particular functionality of the site you rarely use once stops working, and you later find out uMatrix was still messing with some stuff, even if you whitelist all resources.