diff --git a/gfx/thebes/gfxWindowsPlatform.cpp b/gfx/thebes/gfxWindowsPlatform.cpp
index 354326e0c3..bd9ba0211b 100644
--- a/gfx/thebes/gfxWindowsPlatform.cpp
+++ b/gfx/thebes/gfxWindowsPlatform.cpp
@@ -531,9 +531,8 @@ gfxWindowsPlatform::CreatePlatformFontList()
 {
     gfxPlatformFontList *pfl;
 
-    // bug 630201 - older pre-RTM versions of Direct2D/DirectWrite cause odd
-    // crashers so blacklist them altogether
-    if (IsNotWin7PreRTM() && GetDWriteFactory()) {
+    // DirectWrite is Vista+
+    if (IsVistaOrLater() && GetDWriteFactory()) {
         pfl = new gfxDWriteFontList();
         if (NS_SUCCEEDED(pfl->InitFontList())) {
             return pfl;
diff --git a/mfbt/WindowsVersion.h b/mfbt/WindowsVersion.h
index abc9ab59ae..62d6074500 100644
--- a/mfbt/WindowsVersion.h
+++ b/mfbt/WindowsVersion.h
@@ -179,13 +179,6 @@ IsWin11OrLater()
   return IsWindows10BuildOrLater(WinBuild::Win11RTM);
 }
 
-MOZ_ALWAYS_INLINE bool
-IsNotWin7PreRTM()
-{
-  return IsWin7SP1OrLater() || !IsWin7OrLater() ||
-         IsWindowsBuildOrLater(7600);
-}
-
 MOZ_ALWAYS_INLINE bool
 IsWin7AndPre2000Compatible() {
   /*