I can run my project in a browser from my own web-site but some features don't work properly eg. some sprites don't appear when triggered by a 'when I receive a message' event. s thee some problem with the event handling in a browser. I am using the latest version of firefox.
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If you look on the bar (to the left of the flag) you'll see the applet version. Currently on the web site, it is v37.
The current web applet can be downloaded at this link:
Scratch Applet
Sound Bank
Just right-click and choose "save target as" to save it to your computer.
More information here: http://scratch.mit.edu/forums/viewtopic.php?pid=763#p763
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