I came across an interesting issue while trying to replicate Mike Bostock's code using the latest version of d3.js.
If you want to see the graph yourself, here is the link:
While everything looked good in Safari, I noticed some strange behavior with the markers (arrows) when viewed in Firefox. (Check out the screenshot below)
Safari:
Firefox(14.0.1 newest):
If anyone has ideas on how to fix this issue, please let me know!