I opened the demo page: http://sjward.org/jplayer-for-wordpress
The lessig-example-tune started right after "Example single-file players:" started playing automatically and I tried to turn the volume down a little bit.
Mistakenly I tried to move the bar the was the progress bar. First I dragged it near the end, after buffering for a short period it started playing at the position where I let go of the progress bar indicator.
Deciding that now I want to hear it from the beginning I dragged the progress bar indicator back to the beginning.
At that exact moment my browser crashed.
OS: OSX 10.6.8
Browser: Chrome Stable 16.0.912.75
Could reproduce this a couple of times. Other browser didn't do that (Safari 5.1.2, Firefox 9.0.1).
Now I know, that hasn't got anything to do with the plugin but rather with the browser or my machine. I just wanted to check if anybody else experiences this since no other wordpress mp3 player plugin did that (and I tried a couple of those in the last hour).