Foglight recently added support for browser based instrumentation. It implements the W3C Navigation Timing interface, described in http://www.w3.org/TR/2012/REC-navigation-timing-20121217/, to collect performance data for browsers that support this interface.
I was sent this link today for browser compatibility and wanted to pass it on. It will save a bit of searching: http://caniuse.com/nav-timing
Current browser support as of 8/20/2013 is shown here