Thanks, fearless.., for sharing your configuration.
It's seems very comfortable to me in it's security, and I like it! If you'd consider a bit more protection, try the free containment sandbox software
www.sandboxie.com which protects you from 'bad sites' and malicious emails. It is like wearing a glove, if your hand was a computer system. I'm using it right now, & browse with it every time (except when performing updates). You can test drive extensions like the one below as installations are only temporary when done while contained in a "sandbox". You'll see.
You might try NoScript
https://addons.mozilla.org/en-US/firefox/addon/noscript/ which blocks java script, but adjusts to your preferences.
PS CCleaner has a safe disk wipe feature I'd just learned about from a knowledgeable member's post. You'll find it under tools, & it shall wipe the traces specifically from free disc space only!