I upgraded to Mojarra JSF 2.2.1 (from 2.1.22) and since then for each of my requests I\'m having an exception in console:
GRAVE: JSF1094: Co
I don't have enough rep to comment, so I write an answer....
It happens on any browser as Stan Silvert says. 2.1.25 is fixing it, but https://java.net/jira/browse/JAVASERVERFACES-2862 is fixed on 2.1.27 for 2.1.x branch : https://java.net/jira/browse/JAVASERVERFACES-3089
2.1.27 has a due date of January 2nd, 2014.
I can recreate the problem on any browser. I just opened https://java.net/jira/browse/JAVASERVERFACES-2973 to address this.
I think Mojarra 2.2.2 / 2.1.25 will fix this, considering: https://java.net/jira/browse/JAVASERVERFACES-2955