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Firefox dropping support for optgroups?

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It seems that Firefox 4 has dropped support for <optgroup> elements? Why would such a great web development browser do this? Also, the box model has changed with this release.

Not good guys.

It seems that Firefox 4 has dropped support for <optgroup> elements? Why would such a great web development browser do this? Also, the box model has changed with this release. Not good guys.