I never have. Don't know how to do it (I know it's not hard). The only use I occasionally have is blocked media, but I just don't watch whatever it is. It's not that important to me.
What's important to me is blocking ads, which I do as much as possible. The way I see it, the main point of them tracking me is to serve me ads, so I break the chain at the ads.
If I want privacy, I use Tor. Everything else seems like spitting into the wind.