(All the addons recommended here do not have unwanted features, so don't keep saying "I'll not install any extensions".)
Why are you using about:config when it can be managed through Tools>Options>Advanced>Network>(Connection frame)Settings? You need to turn on socks5 too. Apart from those, all other settings are fine.
I will give you a piece of advice though: there are many servers which reject connections from Tor, and it becomes a real PITA to turn off and on -- instead, you should use Foxyproxy (Standard) which allows you to specify on which URLs proxies should be used, and where it should not be.
For protection against active content, use Noscript, which allows you to block Javascript, Flash, Java etc. on a sitewise basis. It also comes with protections against XSS and clickjacking.
You should also change your user agent to something more common, for example, the Firefox 24 UA, since Pale Moon is used by a very small number of people and it will make you more identifiable.
Also, do note that the exit nodes can still spy on traffic, so be sure to get HTTPS everywhere as well (although I suppose if the malicious nodes run sslstrip it'll not be very helpful.)
To check your anonymity, use
Panopticlick and the
test run by Jondonym operators.