If you're online today, assume you are being tracked, or at the very least, that you CAN be tracked. I don't think a browser plugin or browser itself can help you much.
There are wild threads full of (what I think are full of Schizos) discusssions about how to avoid being followed by (insert scary group here). Use a pre-1994 PC running obscure software etc. it goes deep and wild. Just assume and don't go for the honey in the pot.