I don't get why people say firefox is bloated and complicated, could understand before V4, but now?
Chrome is easier in terms of its UI and to work your way around, but FF doesn't require rocket science to use or setup, same options and all just located in different places
True that it doesn't give any memory back when tabs are closed, however even with 2 to 20 tabs open, FF for me uses no more than 450MB max and this is with 7 add ons installed and 5 user styles installed. Chrome actually uses the same or more memory as/than FF for me with the same amount of tabs opened and I only have like 4 addons installed and 2 user styles installed for chrome.
And my FF runs all day, the only time I close it is when I am turning my PC off, never had any problems with it becoming slow or using loads of RAM.
Chromes UI is smoother overall without a doubt but for actual web browsing, unfortunately that isn't the case for me.
This is FF were talking about here

, you can customize it to whatever way you want, I use stratiform add on and IMO looks much better than the ugly stock look:
You can even get a chrome theme as well, which is pretty much identical.
Does FF not have instant search as well and the fancy combined address bar with the search bar and if not I am pretty sure there is an addon for that combination just like chrome, think MRK has it installed.
Also I can type in the address bar and it still acts as a google search bar when I hit enter.
Chrome will work much better on lower end rigs than firefox, but on pretty mid-high end PCs now a days, it really shouldn't be an issue.
And lastly, I couldn't disagree with your last comment any more, if anything FF is moving forward very quickly regarding features and performance now (yes it may not be as popular as chrome etc. but as explained by mrk, we know the real reason as to why that is), if it had still been the same with previous versions before V4, then diff... yes, in fact it would be out of the market by now.
Also on a lot of tech sites, FF is the number one browser of choice i.e. it is the top browser according to toms hardware here:
http://www.tomshardware.com/reviews/firefox-7-web-browser,3037.html