Yes, you can use `elementIsFocusable` with flag=0 to check whether a element is focusable, i.e. does the focus can be moved to a element either with mouse clicking or calling `element.focus()`. And if I read code correctly, you can also use [FLAG_BYMOUSE](https://searchfox.org/mozilla-central/source/dom/interfaces/base/nsIFocusManager.idl#210) to check whether a element is focusable by mouse clicking.
Bug 1847687 Comment 2 Edit History
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Yes, you can use `elementIsFocusable` with flag=0 to check whether a element is focusable, i.e. does the focus can be moved to a element either by mouse clicking or calling `element.focus()`. And if I read code correctly, you can also use [FLAG_BYMOUSE](https://searchfox.org/mozilla-central/source/dom/interfaces/base/nsIFocusManager.idl#210) to check whether a element is focusable by mouse clicking.