When I try to enter on deezer web site, webkit crash and quit immediately (less than a second). I have actually: Mac "OS X.5.7" and "Safari 4 Public Beta" (5528.17). Crash report talk about a failure in "JavaScript Core", but I'm not sure. If you ask me, I think it's "JavaScript Core", or maybe "Flash 10", which execute a too long script like a lot of site nowadays. With only Safari 4 as browser, deezer work very good. Good luck :)
Please attach the crash log: <http://webkit.org/quality/crashlogs.html>.
Created attachment 30292 [details] Crash Report for WebKit
Based on crash log, likely a duplicate of bug 25752.