diff --git a/gfx/layers/apz/src/APZInputBridge.cpp b/gfx/layers/apz/src/APZInputBridge.cpp
index eb57816f7865..5ffb2f51f426 100644
--- a/gfx/layers/apz/src/APZInputBridge.cpp
+++ b/gfx/layers/apz/src/APZInputBridge.cpp
@@ -64,6 +64,8 @@ nsEventStatus APZInputBridge::ReceiveInputEvent(
       // mouse event undergoes (in PositionedEventTargeting.cpp) uses
       // the IGNORE_ROOT_SCROLL_FRAME flag, which is needed for correct
       // hit testing in a zoomed-in or zoomed-out state.
+      // FIXME: bug 1525793 -- this may need to handle zooming or not on a
+      // per-document basis.
       if (gfxPrefs::APZAllowZooming()) {
         mouseEvent.mIgnoreRootScrollFrame = true;
       }
diff --git a/gfx/layers/apz/src/AsyncPanZoomController.cpp b/gfx/layers/apz/src/AsyncPanZoomController.cpp
index de936d6dc15f..9698e60bac96 100644
--- a/gfx/layers/apz/src/AsyncPanZoomController.cpp
+++ b/gfx/layers/apz/src/AsyncPanZoomController.cpp
@@ -1525,6 +1525,8 @@ nsEventStatus AsyncPanZoomController::OnScaleBegin(
 
   // For platforms that don't support APZ zooming, dispatch a message to the
   // content controller, it may want to do something else with this gesture.
+  // FIXME: bug 1525793 -- this may need to handle zooming or not on a
+  // per-document basis.
   if (!gfxPrefs::APZAllowZooming()) {
     if (RefPtr<GeckoContentController> controller =
             GetGeckoContentController()) {
@@ -1569,6 +1571,8 @@ nsEventStatus AsyncPanZoomController::OnScale(const PinchGestureInput& aEvent) {
     mY.UpdateWithTouchAtDevicePoint(aEvent.mLocalFocusPoint.y, aEvent.mTime);
   }
 
+  // FIXME: bug 1525793 -- this may need to handle zooming or not on a
+  // per-document basis.
   if (!gfxPrefs::APZAllowZooming()) {
     if (RefPtr<GeckoContentController> controller =
             GetGeckoContentController()) {
@@ -1702,6 +1706,8 @@ nsEventStatus AsyncPanZoomController::OnScaleEnd(
     return nsEventStatus_eIgnore;
   }
 
+  // FIXME: bug 1525793 -- this may need to handle zooming or not on a
+  // per-document basis.
   if (!gfxPrefs::APZAllowZooming()) {
     if (RefPtr<GeckoContentController> controller =
             GetGeckoContentController()) {
@@ -4074,6 +4080,8 @@ AsyncPanZoomController::GetCurrentAsyncTransformForFixedAdjustment(
   // Use the layout viewport to adjust fixed position elements if and only if
   // it's larger than the visual viewport (assuming we're scrolling the RCD-RSF
   // with apz.allow_zooming enabled).
+  // FIXME: bug 1525793 -- this may need to handle zooming or not on a
+  // per-document basis.
   return (gfxPrefs::APZAllowZooming() && Metrics().IsRootContent() &&
           Metrics().GetVisualViewport().Size() <=
               Metrics().GetLayoutViewport().Size())
diff --git a/gfx/layers/apz/util/APZCCallbackHelper.cpp b/gfx/layers/apz/util/APZCCallbackHelper.cpp
index 66c5c873f2bd..0e7cfd337740 100644
--- a/gfx/layers/apz/util/APZCCallbackHelper.cpp
+++ b/gfx/layers/apz/util/APZCCallbackHelper.cpp
@@ -307,7 +307,8 @@ void APZCCallbackHelper::UpdateRootFrame(const RepaintRequest& aRequest) {
     return;
   }
 
-  if (gfxPrefs::APZAllowZooming() && aRequest.GetScrollOffsetUpdated()) {
+  if (nsLayoutUtils::AllowZoomingForDocument(shell->GetDocument()) &&
+      aRequest.GetScrollOffsetUpdated()) {
     // If zooming is disabled then we don't really want to let APZ fiddle
     // with these things. In theory setting the resolution here should be a
     // no-op, but setting the visual viewport size is bad because it can cause a
@@ -671,7 +672,8 @@ static bool PrepareForSetTargetAPZCNotification(
   nsPoint point = nsLayoutUtils::GetEventCoordinatesRelativeTo(
       aWidget, aRefPoint, aRootFrame);
   EnumSet<FrameForPointOption> options;
-  if (gfxPrefs::APZAllowZooming()) {
+  if (nsLayoutUtils::AllowZoomingForDocument(
+          aRootFrame->PresShell()->GetDocument())) {
     // If zooming is enabled, we need IgnoreRootScrollFrame for correct
     // hit testing. Otherwise, don't use it because it interferes with
     // hit testing for some purposes such as scrollbar dragging (this will
diff --git a/layout/base/MobileViewportManager.cpp b/layout/base/MobileViewportManager.cpp
index f47ba33a0d30..3d11d937bdbd 100644
--- a/layout/base/MobileViewportManager.cpp
+++ b/layout/base/MobileViewportManager.cpp
@@ -506,7 +506,7 @@ void MobileViewportManager::RefreshViewportSize(bool aForceAdjustResolution) {
   MVM_LOG("%p: Updating properties because %d || %d\n", this, mIsFirstPaint,
           mMobileViewportSize != viewport);
 
-  if (gfxPrefs::APZAllowZooming()) {
+  if (nsLayoutUtils::AllowZoomingForDocument(mDocument)) {
     UpdateResolution(viewportInfo, displaySize, viewport,
                      displayWidthChangeRatio, UpdateType::ViewportSize);
   } else {
@@ -545,8 +545,8 @@ void MobileViewportManager::ShrinkToDisplaySizeIfNeeded(
     return;
   }
 
-  if (!gfxPrefs::APZAllowZooming()) {
-    // If the APZ is disabled, we don't scale down wider contents to fit them
+  if (!nsLayoutUtils::AllowZoomingForDocument(mDocument)) {
+    // If zoom is disabled, we don't scale down wider contents to fit them
     // into device screen because users won't be able to zoom out the tiny
     // contents.
     return;
diff --git a/layout/base/PresShell.cpp b/layout/base/PresShell.cpp
index 73725fd9e3f4..7125a184bfe4 100644
--- a/layout/base/PresShell.cpp
+++ b/layout/base/PresShell.cpp
@@ -10502,9 +10502,10 @@ nsresult PresShell::SetIsActive(bool aIsActive) {
 }
 
 void PresShell::UpdateViewportOverridden(bool aAfterInitialization) {
-  // Determine if we require a MobileViewportManager.
-  bool needMVM = nsLayoutUtils::ShouldHandleMetaViewport(mDocument) ||
-                 gfxPrefs::APZAllowZooming();
+  // Determine if we require a MobileViewportManager. This logic is
+  // equivalent to ShouldHandleMetaViewport, which will check gfxPrefs if
+  // there are not meta viewport overrides.
+  bool needMVM = nsLayoutUtils::ShouldHandleMetaViewport(mDocument);
 
   if (needMVM == !!mMobileViewportManager) {
     // Either we've need one and we've already got it, or we don't need one
diff --git a/layout/base/TouchManager.cpp b/layout/base/TouchManager.cpp
index 9dc60292ded2..a6556aa99e7d 100644
--- a/layout/base/TouchManager.cpp
+++ b/layout/base/TouchManager.cpp
@@ -114,7 +114,8 @@ nsIFrame* TouchManager::SetupTarget(WidgetTouchEvent* aEvent,
   // Setting this flag will skip the scrollbars on the root frame from
   // participating in hit-testing, and we only want that to happen on
   // zoomable platforms (for now).
-  if (gfxPrefs::APZAllowZooming()) {
+  dom::Document* doc = aFrame->PresContext()->Document();
+  if (nsLayoutUtils::AllowZoomingForDocument(doc)) {
     flags |= INPUT_IGNORE_ROOT_SCROLL_FRAME;
   }
 
diff --git a/layout/base/ZoomConstraintsClient.cpp b/layout/base/ZoomConstraintsClient.cpp
index 72214b3dd879..1c6261d6e55e 100644
--- a/layout/base/ZoomConstraintsClient.cpp
+++ b/layout/base/ZoomConstraintsClient.cpp
@@ -168,10 +168,10 @@ void ZoomConstraintsClient::ScreenSizeChanged() {
 }
 
 static mozilla::layers::ZoomConstraints ComputeZoomConstraintsFromViewportInfo(
-    const nsViewportInfo& aViewportInfo) {
+    const nsViewportInfo& aViewportInfo, Document* aDocument) {
   mozilla::layers::ZoomConstraints constraints;
-  constraints.mAllowZoom =
-      aViewportInfo.IsZoomAllowed() && gfxPrefs::APZAllowZooming();
+  constraints.mAllowZoom = aViewportInfo.IsZoomAllowed() &&
+                           nsLayoutUtils::AllowZoomingForDocument(aDocument);
   constraints.mAllowDoubleTapZoom =
       constraints.mAllowZoom && gfxPrefs::APZAllowDoubleTapZooming();
   if (constraints.mAllowZoom) {
@@ -209,7 +209,7 @@ void ZoomConstraintsClient::RefreshZoomConstraints() {
       screenSize, PixelCastJustification::LayoutDeviceIsScreenForBounds));
 
   mozilla::layers::ZoomConstraints zoomConstraints =
-      ComputeZoomConstraintsFromViewportInfo(viewportInfo);
+      ComputeZoomConstraintsFromViewportInfo(viewportInfo, mDocument);
 
   if (mDocument->Fullscreen()) {
     ZCC_LOG("%p is in fullscreen, disallowing zooming\n", this);
diff --git a/layout/base/nsLayoutUtils.cpp b/layout/base/nsLayoutUtils.cpp
index 4bf302c64a93..eed51c921738 100644
--- a/layout/base/nsLayoutUtils.cpp
+++ b/layout/base/nsLayoutUtils.cpp
@@ -9351,7 +9351,8 @@ static void UpdateDisplayPortMarginsForPendingMetrics(
     return;
   }
 
-  if (gfxPrefs::APZAllowZooming() && aMetrics.IsRootContent()) {
+  if (nsLayoutUtils::AllowZoomingForDocument(shell->GetDocument()) &&
+      aMetrics.IsRootContent()) {
     // See APZCCallbackHelper::UpdateRootFrame for details.
     float presShellResolution = shell->GetResolution();
     if (presShellResolution != aMetrics.GetPresShellResolution()) {
diff --git a/widget/cocoa/nsChildView.mm b/widget/cocoa/nsChildView.mm
index 84b4b9a2aaeb..9fd78d680d13 100644
--- a/widget/cocoa/nsChildView.mm
+++ b/widget/cocoa/nsChildView.mm
@@ -3678,6 +3678,7 @@ NSEvent* gLastDragMouseDownEvent = nil;
     return;
   }
 
+  // FIXME: bug 1525793 -- this may need to handle zooming or not on a per-document basis.
   if (gfxPrefs::APZAllowZooming()) {
     NSPoint locationInWindow = nsCocoaUtils::EventLocationForWindow(anEvent, [self window]);
     ScreenPoint position =