--- a/dom/base/nsDocument.cpp
+++ b/dom/base/nsDocument.cpp
@@ -11729,22 +11729,16 @@ GetFullscreenError(nsIDocument* aDoc, bo
     // in a Runnable, so don't use GetMozFullScreenEnabled() from a
     // Runnable!
     return nullptr;
   }
 
   if (!nsContentUtils::IsFullScreenApiEnabled()) {
     return "FullscreenDeniedDisabled";
   }
-  if (!aDoc->IsVisible()) {
-    return "FullscreenDeniedHidden";
-  }
-  if (HasFullScreenSubDocument(aDoc)) {
-    return "FullscreenDeniedSubDocFullScreen";
-  }
 
   // Ensure that all containing elements are <iframe> and have
   // allowfullscreen attribute set.
   nsCOMPtr<nsIDocShell> docShell(aDoc->GetDocShell());
   if (!docShell || !docShell->GetFullscreenAllowed()) {
     return "FullscreenDeniedContainerNotAllowed";
   }
 
@@ -11771,16 +11765,24 @@ nsDocument::FullscreenElementReadyCheck(
   if (!GetWindow()) {
     DispatchFullscreenError("FullscreenDeniedLostWindow");
     return false;
   }
   if (const char* msg = GetFullscreenError(this, aWasCallerChrome)) {
     DispatchFullscreenError(msg);
     return false;
   }
+  if (!IsVisible()) {
+    DispatchFullscreenError("FullscreenDeniedHidden");
+    return false;
+  }
+  if (HasFullScreenSubDocument(this)) {
+    DispatchFullscreenError("FullscreenDeniedSubDocFullScreen");
+    return false;
+  }
   if (GetFullscreenElement() &&
       !nsContentUtils::ContentIsDescendantOf(aElement, GetFullscreenElement())) {
     // If this document is full-screen, only grant full-screen requests from
     // a descendant of the current full-screen element.
     DispatchFullscreenError("FullscreenDeniedNotDescendant");
     return false;
   }
   if (!nsContentUtils::IsChromeDoc(this) && !IsInActiveTab(this)) {