While working on some optimizations for my site, I noticed some things in Networking Timings for Chrome Developer Tools differ from those in Firefox Developer Tools.
Very consistently Chrome loads a number of items on the page giving a "200 (from cache)" response. Those same items on Firefox just show as 304 response items.
I am wondering if anyone can explain this. Below are two screen shots for the same resource. First one from Chrome, the second from Firefox.