personally, i hate extensions -- they have a bad track record overall. if i install an extension, i have to keep watching it to be sure it hasn't been sold to a third-party datamining company. same problem with phone apps, but at least phones offer permissions controls for apps.

i trust ublock origin because gorhill is very public, passionate, and transparent. i trust privacy badger because it's backed by the EFF's reputation. those are two very high bars to set and they are literally the only two extensions i trust enough to install on my machine.