Slacker is some kind of music company and their player is not useful in WebKit (nightly r20183, Safari 2.0.4 (419.3), Mac OS X 10.4.9). Seems like page never finish loading and actually pressing the buttons (Play, Edit or similar) does not do anything. I tried ti view source, but it didn't help much so it is all on you, experts. Btw. Interesting service, but opening all links in New Window ???
Created attachment 13629 [details] Pressing Play does not do anything.
Confirmed with r20136. Putting into Plug-Ins component for now (there is an embedded QuickTime player on the page).
I found additional URL and Safari in Source, so maybe it will help: http://www.slacker.com/webplayer/index_embed.vm
Mass closing plug-in bugs, as plug-in support has been removed from WebKit. Please comment and/or reopen if this still affects WebKit in some way.