I have the latest (2.12) version of WPT private instance set up and works great for all browsers but when I try to test a site with SPDY (over SSL) I am not able to see the breakdown of resources in waterfall chart.
I should have 2.13 out in a week or two but until then there have been a lot of changes to Chrome and Firefox since the 2.12 release and you’re better off with the latest agent which will work with the 2.12 UI fine.