I will see if we have a way to contact Walmart. I would not be comfortable landing a patch that breaks previous Firefox behavior, even if it is more correct according to the spec. Walmart is the case we know about, there are likely other sites that do this that we are unaware of, expecially if Chrome has been allowing this behavior.
Bug 1603484 Comment 29 Edit History
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I will see if we have a way to contact Walmart. I would not be comfortable landing a patch that breaks previous Firefox behavior, even if it is more correct according to the spec. Walmart is the case we know about, there are likely other sites that do this that we are unaware of, especially if Chrome has been allowing this behavior.