Yeah....
To harden Firefox you need the following......
Common sense.
Decent anti-virus.
Not running as Admin user.
That's it.
I've never really seen the point of installing half a ton of pointless add-on shareware / freeware programs to your machine. It ends up being almost as bad as the malware you're trying to avoid (eating up resources etc.). Plus no average Joe is ever going to keep all that software up to date like they should !
KISS as they say..... Keep It Simple Silly.