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Now I'm sure there is good reason to only "supporting" a single browser at this time, I want to give people the opportunity to find out for themselves. Here is a small JavaScript snippet that will enable allow other browsers to run the Grooveshark Preview.
Step 1
Goto: http://preview.grooveshark.com/ and sign in. It will soon complain about not being able to load in your browser.
Step 2
In the address bar copy and paste:
Then press enter. All the warnings should disappear.
Step 3
Have fun playing :)