Tried installing ST3 FFN by cloning the git project (is there a better way?). Some issues:
multiconf.py:44: Single instance of "\U" in C:\Users in docstring. Backslash needs to be doubled.
Two instances of isinstance(key, basestring). Basestring is gone now, should be str(?)
fuzzy_file_nav.py:29: Usage of "FuzzyFileNav: %s" % s. % operator appears to be gone, should be replaced with .format() call.
I'm not conversant with Python 3, so the above suggestions are just guesses from Googling.
And finally, after all that:
File "/Users/jsc/Library/Application Support/Sublime Text 3/Packages/FuzzyFileNav/fuzzy_file_nav.py", line 13, in
from multiconf import get as qualify_settings
ImportError: No module named 'multiconf'
It looks like it's loading fuzzy_file_nav.py, and THEN trying to load multiconf.py as a plugin? Not sure what's going on.