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According to caniuse.com, Chrome has supported dialog since 2014. It also says that Firefox does support it, but only if you enable dom.dialog_element.enabled in about:config.

The MDN page for the dialog element does not list any such notes, nor does it contain an explanation for why it's disabled: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/dialog

Why does Firefox have the dialog element disabled by default after 5 years of Chrome having it? Does Mozilla want to discourage its use for some reason?

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    There is not really a concise answer to your "why" question, but you can review some of the discussion about this issue at bugzilla.mozilla.org/show_bug.cgi?id=840640
    – benvc
    Commented Oct 3, 2019 at 18:46
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    That developer.mozilla.org page does mention the Firefox issue in the browser compatibility table, but you have to click the little down arrow under Firefox to make the note visible.
    – Jussi Hirvi
    Commented Nov 30, 2020 at 7:27

1 Answer 1

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There are some details on the bug tracker.

In short, there are bugs with the current implementation and so it isn't considered ready for release. These are mostly accessibility related (for example, focusing the right element when the dialog is opened and closed).

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