Rated 5 out of 5 stars

For TBird 3.x.x: Install Nightly Tester Tools add-on, then head over to the developer's page at http://www.kaarposoft.dk/noksync/ to get the latest 1.0.50 version of NokSync and add it to your TB.
I'm not responsible if something goes wrong. This method works just fine for me.