Great tool to have fine-grained control of what a website is allowed to do!
However, it is more for the advanced user that has a rough understanding what is necessary, and what is not.

I just love it.

Ragyogóan láthatóvá teszi, ki mindenkihez kapcsolódunk a háttérben, és részleteiben szabályozhatjuk, ki mihez férhet hozzá. Persze egy kis IT ismeret szükségeltetik hozzá.

was a good extension

It causes a lot of websites to stop working altogether

This was working great until I just updated Firefox to v 90.0.2 (64-bit). Now, if I have uMatrix enabled, none of my browser pages display. If I disable it, they do display.