Yes, Chrome is the current 800lbs gorilla, and they continue to grow.
I am still operating under a browser wars mentality where Netscape/Mozilla's marketshare completely collapsed and they slowly recovered over time. I'm just impressed that Firefox is in double digits in terms of marketshare given that they don't have a huge marketing engine driving them (Okay, I guess Yahoo is pretty decent as engines go.)
I remember when Chrome shipped with V8 as being a big turning point for the way Firefox was run. Management went from complacent to reactionary. The bug reports regarding JavaScript performance in the Firefox bug tracker at that time were really fascinating to watch - Mozilla was a very disturbed hornets' nest! Then came rapid release and all the arewe*yet.com websites, etc.
Mozilla has been punching above their weight class ever since Chrome came to market, but I perceive that recently Mozilla management has been transitioning from reactionary to offensive. Their moves on Rust and sunsetting XUL and XPCOM are geared towards security AND performance, which are painful and necessary shifts. Largely hitting pause on FirefoxOS and Thunderbird and everything else not Firefox is also the right, if painful, thing to do.
That's why I'm going to stick with my assertion. Every day that Mozilla/Firefox doesn't shrivel up and die has to be a concern to the Chrome team!