Should I install a new add-on or extension in Tor Browser, like AdBlock Plus or uBlock Origin?

U’re damned if u do and damned is u don’t;
Using bare install Tor doesn’t block many malicious ads, and users get multitude of regular ads to the point it’s ridiculous. It also slows net traffic, sometimes to a crawl.

…or spyware developed by Israelis, NSA etc. which when clicked on takes over whole OS seamlessly in the background. Doesn’t matter which regular OS you’re using. Only way to block such spyware is to use encrypted privacy hardened OS = whonix, obscurix, securityonion, etc

There are millions of PPL using Ublock etc. as Tor doesn’t come with a comprehensive ads blocker. So their fingerprint is not that unique.