And, install ablock and ghostery. Its amazing how many companies track you all around the web. You might not mind. But I do.
I'm using Bluehell Firewall and NoScript. NoScript has a no-tracking feature. Both AdBlock Plus and Ghostery have serious memory leaks.
I'm also using RequestPolicy and RefControl. RefControl is great because it effectively kills all tracking, presenting your browser to a site as if it just magically appeared at the root of the site and not coming from the site you just left. Request Policy can stop tracking/analytics sites from the get go.
I also use NO Google Analytics (which kills Google Analytics anywhere it's found, period).
One thing I do like about ABP though is the ABP Element killer. It lets you selectively remove parts of a website you don't wish to see.
However, if you really MUST use ABP I would suggest Ad Block Edge (ABE) instead. It still has a memory leak, but it's not as severe and you can still use it with the ABP Element killer and any ABP lists. You also don't have to opt out from ABP's phoning your info back home, because ABE doesn't do that at all.
Note that Classilla presents itself as a mobile phone (nokia) and so defaults to a mobile browser interface, which is fine for a lot of routine browsing, like macrumors.com for instance.
You can use Default User Agent or any other UA changer addon to force T4Fx to use a mobile UA (of your choice). That way T4Fx only opens mobile sites. Just an alternative.
Also, if you don't want to use a UA changer addon at all, just change the UA string in about:config for T4FX to a mobile one if you just want to browse mobile sites.