It's working good with microb here. Just forget about pref.js it is not needed to tweak the device. Just download tune-up-startup, tune-up, bad_packets, htb, tc to a folder in /etc/tuneup. Copy tune-up-startup to /home/users. Edit tune-up-startup to point to /etc/tuneup then run the script. Other method is also glimpse into the code and copy the url's of the files and dl with wget. Hope this helps!

P.S: pref.js is good to tweak microb. dl pref.js with wget. open rootshell and type find . -name "*pref.js" then change to that directory cd .. . Look for the latest pref.js in that directory and replace it my pref.js (don't forget to make a backup). You can control the settings by typeing about:config in the adressbar of microb. Please try that method with the other files my,cnf and myconfig, too. I will try to keep them as fresh as possible.