I just created a jQuery based HAR view widget.
This is not as feature rich as the HAR viewer at
http://www.softwareishard.com/blog/har-viewer/ as my main motivation
(a) keep the widget small and embeddable in any page
(b) generate waterfall UI incrementally as requests are being made. It
has an API to add entries, requests, responses, and timings as data
for those becomes available
There is an online demo at http://s3u.github.com/har-view/ (tested in
latest versions Firefox and Chrome).
Thanks for any comments.