WebGL is blacklisterd for Intel HD 3000 driver ver 8.15.10.2418 dated 6/10/2011.
FF 17.0.1 Should be working according to https://wiki.mozilla.org/Blocklisting
Works fine after enabling WebGL manually about:config webgl.force-enabled=true.
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does it work when you update to the latest driver available?
http://downloadcenter.intel.com/Detail_Desc.aspx?agr=Y&DwnldID=22083
Thanks for the reply !
This link installs video card driver ver 9.17.10.2875 from 10/17/2012 but the problem is still reproduced. No WebGL support by default . Works fine if WebGL is enabled explicitly in config.
Thanks, Sergey