diff --git a/browser/components/shell/nsGNOMEShellService.cpp b/browser/components/shell/nsGNOMEShellService.cpp
index bb95c362c91b..b6313bafedf6 100644
--- a/browser/components/shell/nsGNOMEShellService.cpp
+++ b/browser/components/shell/nsGNOMEShellService.cpp
@@ -23,7 +23,6 @@
 #include "imgIRequest.h"
 #include "imgIContainer.h"
 #include "mozilla/Sprintf.h"
-#include "mozilla/WidgetUtilsGtk.h"
 #include "mozilla/dom/Element.h"
 #if defined(MOZ_WIDGET_GTK)
 #  include "nsIImageToPixbuf.h"
@@ -73,15 +72,17 @@ static const MimeTypeAssociation appTypes[] = {
 #define kDesktopColorGSKey "primary-color"
 
 static bool IsRunningAsASnap() {
-  const char* snapName = mozilla::widget::WidgetUtilsGTK::GetSnapInstanceName();
+  // SNAP holds the path to the snap, use SNAP_NAME
+  // which is easier to parse.
+  const char* snap_name = PR_GetEnv("SNAP_NAME");
 
   // return early if not set.
-  if (snapName == nullptr) {
+  if (snap_name == nullptr) {
     return false;
   }
 
-  // snapName as defined on https://snapcraft.io/firefox
-  return (strcmp(snapName, "firefox") == 0);
+  // snap_name as defined on https://snapcraft.io/firefox
+  return (strcmp(snap_name, "firefox") == 0);
 }
 
 nsresult nsGNOMEShellService::Init() {
diff --git a/toolkit/profile/moz.build b/toolkit/profile/moz.build
index 37cc406882ce..db4df9abb2a7 100644
--- a/toolkit/profile/moz.build
+++ b/toolkit/profile/moz.build
@@ -30,9 +30,6 @@ if CONFIG["OS_TARGET"] == "Android":
 
 UNIFIED_SOURCES += ["nsToolkitProfileService.cpp"]
 
-if CONFIG["MOZ_WIDGET_TOOLKIT"] == "gtk":
-    CXXFLAGS += CONFIG["MOZ_GTK3_CFLAGS"]
-
 LOCAL_INCLUDES += [
     "../xre",
 ]
diff --git a/toolkit/profile/nsToolkitProfileService.cpp b/toolkit/profile/nsToolkitProfileService.cpp
index 363a0a075c31..9dabfae37601 100644
--- a/toolkit/profile/nsToolkitProfileService.cpp
+++ b/toolkit/profile/nsToolkitProfileService.cpp
@@ -50,10 +50,6 @@
 #include "mozilla/Telemetry.h"
 #include "nsProxyRelease.h"
 
-#if defined(MOZ_WIDGET_GTK)
-#  include "mozilla/WidgetUtilsGtk.h"
-#endif
-
 using namespace mozilla;
 
 #define DEV_EDITION_NAME "dev-edition-default"
@@ -1837,19 +1833,14 @@ nsToolkitProfileService::CreateProfile(nsIFile* aRootDir,
  * get essentially the same benefits as dedicated profiles provides.
  */
 bool nsToolkitProfileService::IsSnapEnvironment() {
-#if defined(MOZ_WIDGET_GTK)
-  const char* snapName = mozilla::widget::WidgetUtilsGTK::GetSnapInstanceName();
-
-  // return early if not set.
-  if (snapName == nullptr) {
+  // Copied from IsRunningAsASnap() in
+  // browser/components/shell/nsGNOMEShellService.cpp
+  // TODO: factor out this common code in one place.
+  const char* snap_name = PR_GetEnv("SNAP_NAME");
+  if (snap_name == nullptr) {
     return false;
   }
-
-  // snapName as defined on https://snapcraft.io/firefox
-  return (strcmp(snapName, "firefox") == 0);
-#endif
-
-  return false;
+  return (strcmp(snap_name, "firefox") == 0);
 }
 
 /**
diff --git a/widget/gtk/WidgetUtilsGtk.cpp b/widget/gtk/WidgetUtilsGtk.cpp
index 940d2a93f1b5..66e764e26799 100644
--- a/widget/gtk/WidgetUtilsGtk.cpp
+++ b/widget/gtk/WidgetUtilsGtk.cpp
@@ -5,7 +5,6 @@
 
 #include "WidgetUtilsGtk.h"
 #include "nsWindow.h"
-#include "prenv.h"
 #include <gtk/gtk.h>
 #include <dlfcn.h>
 
@@ -45,15 +44,6 @@ int32_t WidgetUtilsGTK::IsTouchDeviceSupportPresent() {
   return result;
 }
 
-const char* WidgetUtilsGTK::GetSnapInstanceName() {
-  char* instanceName = PR_GetEnv("SNAP_INSTANCE_NAME");
-  if (instanceName != nullptr) {
-    return instanceName;
-  }
-  // Compatibility for snapd <= 2.35:
-  return PR_GetEnv("SNAP_NAME");
-}
-
 bool IsMainWindowTransparent() {
   return nsWindow::IsToplevelWindowTransparent();
 }
diff --git a/widget/gtk/WidgetUtilsGtk.h b/widget/gtk/WidgetUtilsGtk.h
index 2dc0cafbcae1..bc3393644b52 100644
--- a/widget/gtk/WidgetUtilsGtk.h
+++ b/widget/gtk/WidgetUtilsGtk.h
@@ -16,11 +16,6 @@ class WidgetUtilsGTK {
  public:
   /* See WidgetUtils::IsTouchDeviceSupportPresent(). */
   static int32_t IsTouchDeviceSupportPresent();
-
-  /* When packaged as a snap, strict confinement needs to be accounted for.
-     See https://snapcraft.io/docs for details.
-     Return the snap's instance name, or null when not running as a snap. */
-  static const char* GetSnapInstanceName();
 };
 
 bool IsMainWindowTransparent();
diff --git a/widget/gtk/WindowSurfaceWayland.cpp b/widget/gtk/WindowSurfaceWayland.cpp
index 1c2135e15fbc..f11af4ebec2f 100644
--- a/widget/gtk/WindowSurfaceWayland.cpp
+++ b/widget/gtk/WindowSurfaceWayland.cpp
@@ -5,7 +5,6 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "nsWaylandDisplay.h"
-#include "WidgetUtilsGtk.h"
 #include "WindowSurfaceWayland.h"
 
 #include "nsPrintfCString.h"
@@ -170,17 +169,9 @@ RefPtr<nsWaylandDisplay> WindowBackBuffer::GetWaylandDisplay() {
 
 static int WaylandAllocateShmMemory(int aSize) {
   int fd = -1;
-
-  nsCString shmPrefix("/");
-  const char* snapName = mozilla::widget::WidgetUtilsGTK::GetSnapInstanceName();
-  if (snapName != nullptr) {
-    shmPrefix.AppendPrintf("snap.%s.", snapName);
-  }
-  shmPrefix.Append("wayland.mozilla.ipc");
-
   do {
     static int counter = 0;
-    nsPrintfCString shmName("%s.%d", shmPrefix.get(), counter++);
+    nsPrintfCString shmName("/wayland.mozilla.ipc.%d", counter++);
     fd = shm_open(shmName.get(), O_CREAT | O_RDWR | O_EXCL, 0600);
     if (fd >= 0) {
       // We don't want to use leaked file