What is your threat model? If you want to avoid corporate espionage, just run tor browser at the max setting and don't resize the browser window. You will still be vulnerable to various fingerprinting attacks, but there is not much you can do about it.
If you're trying to be safe from governments, there is almost nothing you can do. The web protocols and standards are designed to be insecure on purpose and their software implementations tend to be shitty, since quality programming has very little demand on the consumer market. The Tor network itself is a low latency network, which makes it very vulnerable to timing attacks. On top of that, pretty much all encryption used on the internet is vulnerable to quantum computer attacks, but as far as we know, NSA does not have that kind of technology yet.
