Having tested the interactivity of various WebGL applications on low-to-medium-end graphics cards, I will say that Chrome's does have significantly higher latency than Firefox. Try this demo:
Crank the number of instances up until the frame rate drops (on my Intel HD Graphics 4000 it's about 20,000) and then drag your mouse. Notice that the drag latency is significantly worse in Chrome than Firefox.
I can get up to 51k before I start to notice a drop in Chrome (M27) and in Firefox (R19) I can only get to about 27k. So it might just be that Chrome isn't optimized for your Intel graphics and is better with dedicated cards?
http://n3emscripten.appspot.com/instancing.html
Crank the number of instances up until the frame rate drops (on my Intel HD Graphics 4000 it's about 20,000) and then drag your mouse. Notice that the drag latency is significantly worse in Chrome than Firefox.