by the way I've never seen any 3dgs game running in browser, ...
http://firoball.de/jdosbox/index.htm You just need to allow your Java to be activated on this web address in your Java Security settings (Control Panel -> Java -> Security -> Edit sitelist). Works also in Chrome.
(But is A3
)
edit: too bad - just updated my Chrome and indeed it's not working anymore
Firefox still allows execution, though.