Because now HTML5 is not a project, but the recommended standard - it is strange that Mozilla still does not implement this type of input.
If you really want to know when you can ask here: Error 825294 - Implement I / O types on the desktop .
Also, vote for this issue and write something inspiring to the Firefox team. Hope this helps them solve this problem. :)
And now he seems to be in firefox 57 ( https://hacks.mozilla.org/2017/09/firefox-quantum-developer-edition-fastest-firefox-ever/ )
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