diff --git a/gfx/thebes/gfxUserFontSet.cpp b/gfx/thebes/gfxUserFontSet.cpp
index 6ea4ba03fa9c..ceebd7802b09 100644
--- a/gfx/thebes/gfxUserFontSet.cpp
+++ b/gfx/thebes/gfxUserFontSet.cpp
@@ -839,18 +839,7 @@ void gfxUserFontEntry::FontDataDownloadComplete(
   // download successful, make platform font using font data
   if (NS_SUCCEEDED(aDownloadStatus) &&
       mFontDataLoadingState != LOADING_TIMED_OUT) {
-    if (StaticPrefs::gfx_downloadable_fonts_sanitize_omt()) {
-      LoadPlatformFontAsync(aSrcIndex, aFontData, aLength, aCallback);
-    } else {
-      bool loaded = LoadPlatformFontSync(aSrcIndex, aFontData, aLength);
-      aFontData = nullptr;
-      if (loaded) {
-        IncrementGeneration();
-        aCallback->FontLoadComplete();
-      } else {
-        FontLoadFailed(aCallback);
-      }
-    }
+    LoadPlatformFontAsync(aSrcIndex, aFontData, aLength, aCallback);
     return;
   }
 
diff --git a/modules/libpref/init/StaticPrefList.yaml b/modules/libpref/init/StaticPrefList.yaml
index f76cf6232d26..d1028826409b 100644
--- a/modules/libpref/init/StaticPrefList.yaml
+++ b/modules/libpref/init/StaticPrefList.yaml
@@ -5978,12 +5978,6 @@
   value: false
   mirror: always
 
-# Whether font sanitization is performed on the main thread or not.
-- name: gfx.downloadable_fonts.sanitize_omt
-  type: RelaxedAtomicBool
-  value: true
-  mirror: always
-
 # Whether to validate OpenType variation tables in fonts.
 - name: gfx.downloadable_fonts.validate_variation_tables
   type: RelaxedAtomicBool