box-sizing:border-box; not support by firefox 20.0 build version for android
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It needs to be prefixed with -moz- according to https://developer.mozilla.org/en-US/docs/CSS/box-sizing
Did this work in 19? If so, this sounds like a regression. Would you mind filing a bug, if you're comfortable with Bugzilla? Otherwise we'll go ahead and file it.
thanks its works firefox android mobile version