can't browse google body with firefox beta webgl is confirmed true for all websites

Create a new profile exclusively for the 4.0 beta version and create a desktop shortcut with -P "profile" appended to the target to launch that profile.

• http://kb.mozillazine.org/Testing_pre-release_versions
• http://kb.mozillazine.org/Using_multiple_profiles_-_Firefox

If that new profile works then you can transfer some files from the old profile to that new profile (be careful not to copy corrupted files)

See http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

Google may not have update the Google Body site to reflect that Firefox 4 b8 is WebGL enabled. Try giving it a little time.

Also, if you're still having trouble with WebGL, please post the information from Help>Troubleshooting Information under Graphics at the bottom.

The web page uses a test script like this to test for WebGL support (copy and paste in the location bar)

data:text/html;charset=utf-8,
<html>
<head>
<script>function browserSupportsWebGL() {var canvas = document.getElementById('gltest');var context = null;var names = ["webgl", "experimental-webgl", "webkit-3d", "moz-webgl"];for (var i = 0; i < names.length; ++i) {try { context = canvas.getContext(names[i]); } catch(e) {}if (context) { break; }}return context != null;};function show(){alert('WebGL '+(browserSupportsWebGL()?'':'not ')+'supported');}</script>
</head>
<body onload="show()">
<canvas id="gltest" style="width:1px; height:1px">
</body>
</html>

Does the discussion following apply? http://forums.mozillazine.org/viewtopic.php?f=23&t=2065031