Why is the "dialog" element disabled by default in Firefox?

Question

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?

Answer 1

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).