I installed the latest JNF yesterday by dragging into ext. window. It worked OK, with develop mode on.
But today i got the message that all extensions were disabled, if not coming from the chrome store. and there's a checkbox to re-enable them, but on the JNF and other waze tools, its grey. So not working currently, also in dev.mode as said.
Using Chrome 33.0.1750.70 beta-m
Going to install the tampermonkey now.