>>637087Absolutely not, it's the best option for privacy there is.
There is only two known weaknesses, malicious nodes (sybil attack), and traffic correlation. Firefox exploits have nothing to do with Tor.
It's one of the only projects I've considered donating to. As an American, one of the most effected demographics on Earth that face real-world state-backed violence for internet usage, I appreciate the service and peace-of-mind that Tor provides.