mdInput placeholder for type="number" duplicated in FF

[PeS82]

Bug, feature request, or proposal:

BUG, in FireFox; in Chrome it is OK.

What is the expected behavior?

When focused, placeholder floats above input field, input field is empty (or has value)

What is the current behavior?

Input field still has placeholder, is duplicated.

What are the steps to reproduce?

https://plnkr.co/edit/01tM9NFhIlcLUgHDQ8KZ?p=preview

What is the use-case or motivation for changing an existing behavior?

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

See plunker, FireFox 53.0.2

Is there anything else we should know?

[jelbourn]

@mmalerba can reproduce in Firefox

[mmalerba]

cause by this FF bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1004130#c20 I'll look into a workaround

[mmalerba]

FF folks filed a separate bug to track which is now marked as fixed, so this should just resolve itself soon... https://bugzilla.mozilla.org/show_bug.cgi?id=1368113

edit: confirmed fix in FF 55.0b3

[mmalerba]

firefox has released this fix now

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