Fullscreen used to have a way to detect if the page t that requests fullscreen navigates away during fullscreen process in https://searchfox.org/mozilla-central/rev/3fa5cc437a4937c621ea068ba5dc246f75831633/browser/actors/DOMFullscreenChild.jsm#29-36, but after bug 1669961, `JSWindowActorChild.contentWindow` returns null after navigation, so Fullscreen code bails out early in https://searchfox.org/mozilla-central/rev/3fa5cc437a4937c621ea068ba5dc246f75831633/browser/actors/DOMFullscreenChild.jsm#17.
Bug 1730750 Comment 6 Edit History
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Fullscreen used to have a way to detect if the page that requests fullscreen has navigated away during fullscreen process in https://searchfox.org/mozilla-central/rev/3fa5cc437a4937c621ea068ba5dc246f75831633/browser/actors/DOMFullscreenChild.jsm#29-36, but after bug 1669961, `JSWindowActorChild.contentWindow` returns null after navigation, so Fullscreen code bails out early in https://searchfox.org/mozilla-central/rev/3fa5cc437a4937c621ea068ba5dc246f75831633/browser/actors/DOMFullscreenChild.jsm#17.