Chromium has the feature for their extensions where you can choose to allow certain ones in incognito and disallow others. Firefox lacks this feature.
For instance let's say you use the addon Webmail Notifier or whatever it is called in Firefox. If you go in Private browsing, the addon will go ahead and log you into Google, Live or whatever else you have going on in the addon. BAM! breach of privacy!
Also what is the deal with the spelling, it's clearly one word, yet I always find myself typing it FireFox instead of Firefox. Main reason is that it is made up of two individual words, Fire and Fox. Cunning as a fox, but hot as fire. Obviously this problem would have never existed had they chosen a name like... Chromium, which incidentally is what Google chose for their browser.
Anyways, I'm just rambling on here. I'll just hit Post and then we can all get on with our day.