diff --git a/browser/installer/windows/nsis/shared.nsh b/browser/installer/windows/nsis/shared.nsh
index 0daa8f347c89..ae62d30ae69f 100755
--- a/browser/installer/windows/nsis/shared.nsh
+++ b/browser/installer/windows/nsis/shared.nsh
@@ -58,17 +58,6 @@
     ${If} "$0" != "${GREVersion}"
       WriteRegStr HKLM "Software\mozilla.org\Mozilla" "CurrentVersion" "${GREVersion}"
     ${EndIf}
-
-    ; Image File Execution Options were set for a short period on AArch64 (ARM64)
-    ; to disable multi-threaded DLL loading, which breaks with the sandbox.
-    ; A better solution was found, so this code is to clean up any entries left
-    ; lying around. Bug 1525981 tracks removing this.
-    ${If} "${ARCH}" == "AArch64"
-      StrCpy $0 "Software\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\${FileMainEXE}"
-      DeleteRegKey HKLM "$0"
-      StrCpy $0 "Software\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\plugin-container.exe"
-      DeleteRegKey HKLM "$0"
-    ${EndIf}
   ${EndIf}
 
   ; Adds a pinned Task Bar shortcut (see MigrateTaskBarShortcut for details).