Do they need more funding? They made $163 million in revenue in 2011 after which they signed a $300m/year deal which ends this year, all of this and most of their money in general is provided by Google.
I don't know why people keep on saying this (about UI). My father had never operated a Computer, smartphone up to sometime back and he doesn't know English more than what a kid in 4th grade (in US/UK) would know. He still operates in Firefox without a problem for his business, changes settings when I ask him to (though mostly he doesn't need to). In fact, as a self-proclaimed geek, I have difficulty finding options in Chrome where everything is crammed in one menu followed by a giant 'web page' of settings in which finding anything is hard. And for doing anything useful you have to anyway click the 'Advanced' section ...
Mozilla needs funding, it's not uncommon to do this in browsers.