gonzalo no!
On uBO settings, clicking on "I am an advanced user" activates what they call "medium mode". It opens a window similar to that of uMatrix, when you click on the extension's icon - a bit simplified I think. It has all JS, frames and images allowed by default and you have to deny one by one.
There's also hard mode, which is when you disable everything by default globally, then have to allow one by one.
Mullvad Browser (which is Tor Browser minus the Tor network) comes with just uBO and NoScript - uBO for ads, and NoScript with scripts allowed, because it's still the best protection against cross site script attacks. You can use uBO on hard mode for safety, as it reduces the attack surface, at the cost of privacy (because it increases your fingerprint)