Actually, Firefox has one huge advantage over Chrome - their continued support of NPAPI. Chrome dropped NPAPI as of May, and along with it support for Java plugins. Like them or not, Java plugins are used in HUNDREDS OF THOUSANDS of huge enterprises for internal applications. By dropping NPAPI support, Chrome basically gave a big middle finger to all these enterprises.
I work for one of these huge companies. A bunch of our internal systems requires the use of Java plugins via NPAPI - and there is no way they are going to spend hundreds of thousands (millions?) of dollars to replace all of these internal applications, when Chrome was never an officially supported browser in the first place.
Since Chrome dropped NPAPI, I can no longer use any of these applications in it, so I am now back to Firefox for them. And if I am going to run Firefox for some things, I am going to run it for everything, because I frankly don't have the time or patience to run deal with two web browsers every day.