I tried searching a regression for this, but it turns out that it will be broken on builds as early as the first months of 2017. Trying older builds than that, will not want to share the screen at all.
Bug 1623018 Comment 9 Edit History
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I tried searching a regression for this, but it turns out that it will be broken on builds as early as the first months of 2017. Trying older builds than that, will refuse to share the screen at all, as the page will remain white.