Tor Browser 5.5.1 is released
Most notably, this release features fixes for regressions caused by our font fingerprinting defense: chinese users should have a functional Tor Browser again and emoji support is restored on OS X and Linux systems (we are still working on a fix for Windows).
Moreover, we fixed an oversight in one of our patches which broke some websites depending heavily on iframes.
The full changelog since 5.5 is:
Tor Browser 5.5.1 -- February 5 2016
I'm not sure what exactly you're talking about with setting "as many domains to untrusted" but it sounds like something that could be used for fingerprinting. If security is a concern you're best off simply setting the security slider to High.