diff --git a/gfx/thebes/gfxPlatformFontList.cpp b/gfx/thebes/gfxPlatformFontList.cpp
index bc0e123f85..52ec46f76b 100644
--- a/gfx/thebes/gfxPlatformFontList.cpp
+++ b/gfx/thebes/gfxPlatformFontList.cpp
@@ -13,6 +13,7 @@
 #include "gfxTextRun.h"
 #include "gfxUserFontSet.h"
 #include "SharedFontList-impl.h"
+#include "MaskConfig.hpp"
 
 #include "GeckoProfiler.h"
 #include "nsCRT.h"
@@ -303,6 +304,16 @@ gfxPlatformFontList::gfxPlatformFontList(bool aNeedFullnamePostscriptNames)
 
   mFontPrefs = MakeUnique<FontPrefs>();
 
+  // Hijack the kFontSystemWhitelistPref pref
+  if (std::vector<std::string> fontValues = MaskConfig::GetStringList("fonts");
+      !fontValues.empty()) {
+    std::string fontValuesJoined =
+        std::accumulate(fontValues.begin(), fontValues.end(), std::string(),
+                        [](const std::string& acc, const std::string& s) {
+                          return acc.empty() ? s : acc + "," + s;
+                        });
+    Preferences::SetCString(kFontSystemWhitelistPref, fontValuesJoined.data());
+  }
   gfxFontUtils::GetPrefsFontList(kFontSystemWhitelistPref, mEnabledFontsList);
   mFontFamilyWhitelistActive = !mEnabledFontsList.IsEmpty();
 
diff --git a/gfx/thebes/moz.build b/gfx/thebes/moz.build
index 3d99906827..a9d1191688 100644
--- a/gfx/thebes/moz.build
+++ b/gfx/thebes/moz.build
@@ -305,3 +305,6 @@ DEFINES["GRAPHITE2_STATIC"] = True
 CXXFLAGS += ["-Werror=switch"]
 
 include("/tools/fuzzing/libfuzzer-config.mozbuild")
+
+# DOM Mask
+LOCAL_INCLUDES += ["/omegacfg"]
\ No newline at end of file
diff --git a/layout/style/FontFace.cpp b/layout/style/FontFace.cpp
index f1a90334ea..47d3a881ac 100644
--- a/layout/style/FontFace.cpp
+++ b/layout/style/FontFace.cpp
@@ -237,7 +237,16 @@ void FontFace::SetSizeAdjust(const nsACString& aValue, ErrorResult& aRv) {
   mImpl->SetSizeAdjust(aValue, aRv);
 }
 
-FontFaceLoadStatus FontFace::Status() { return mImpl->Status(); }
+FontFaceLoadStatus FontFace::Status() {
+  nsAutoCString fontFamily;
+  GetFamily(fontFamily);
+
+  if (mozilla::dom::IsFontAllowed(fontFamily)) {
+    return FontFaceLoadStatus::Loaded;
+  } else {
+    return FontFaceLoadStatus::Error;
+  }
+}
 
 Promise* FontFace::Load(ErrorResult& aRv) {
   EnsurePromise();
@@ -247,7 +256,17 @@ Promise* FontFace::Load(ErrorResult& aRv) {
     return nullptr;
   }
 
-  mImpl->Load(aRv);
+  nsAutoCString fontFamily;
+  GetFamily(fontFamily);
+
+  if (mozilla::dom::IsFontAllowed(fontFamily)) {
+    // For allowed fonts, always resolve the promise
+    mLoaded->MaybeResolve(this);
+  } else {
+    // For non-allowed fonts, always reject the promise
+    mLoaded->MaybeReject(NS_ERROR_FAILURE);
+  }
+
   return mLoaded;
 }
 
diff --git a/layout/style/FontFaceImpl.cpp b/layout/style/FontFaceImpl.cpp
index 9d1f7c8c5b..926315ca2f 100644
--- a/layout/style/FontFaceImpl.cpp
+++ b/layout/style/FontFaceImpl.cpp
@@ -357,21 +357,15 @@ void FontFaceImpl::DoLoad() {
 void FontFaceImpl::SetStatus(FontFaceLoadStatus aStatus) {
   gfxFontUtils::AssertSafeThreadOrServoFontMetricsLocked();
 
-  if (mStatus == aStatus) {
-    return;
-  }
+  nsAutoCString fontFamily;
+  GetFamily(fontFamily);
 
-  if (aStatus < mStatus) {
-    // We're being asked to go backwards in status!  Normally, this shouldn't
-    // happen.  But it can if the FontFace had a user font entry that had
-    // loaded, but then was given a new one by FontFaceSet::InsertRuleFontFace
-    // if we used a local() rule.  For now, just ignore the request to
-    // go backwards in status.
-    return;
+  if (IsFontAllowed(fontFamily)) {
+    mStatus = FontFaceLoadStatus::Loaded;
+  } else {
+    mStatus = FontFaceLoadStatus::Error;
   }
 
-  mStatus = aStatus;
-
   if (mInFontFaceSet) {
     mFontFaceSet->OnFontFaceStatusChanged(this);
   }
diff --git a/layout/style/FontFaceImpl.h b/layout/style/FontFaceImpl.h
index 70c06609e9..66b2666621 100644
--- a/layout/style/FontFaceImpl.h
+++ b/layout/style/FontFaceImpl.h
@@ -8,6 +8,7 @@
 #define mozilla_dom_FontFaceImpl_h
 
 #include "mozilla/dom/FontFaceBinding.h"
+#include "MaskConfig.hpp"
 #include "mozilla/FontPropertyTypes.h"
 #include "mozilla/Maybe.h"
 #include "mozilla/Mutex.h"
@@ -35,6 +36,20 @@ class UTF8StringOrArrayBufferOrArrayBufferView;
 
 namespace mozilla::dom {
 
+// Helper function to check if a font is in the allowed list
+inline bool IsFontAllowed(const nsACString& aFontName) {
+  if (std::vector<std::string> maskValues =
+          MaskConfig::GetStringListLower("fonts");
+      !maskValues.empty()) {
+    std::string fontName(aFontName.BeginReading(), aFontName.EndReading());
+    std::transform(fontName.begin(), fontName.end(), fontName.begin(),
+                   ::tolower);
+    return std::find(maskValues.begin(), maskValues.end(), fontName) !=
+           maskValues.end();
+  }
+  return true;
+}
+
 class FontFaceImpl final {
   NS_INLINE_DECL_THREADSAFE_REFCOUNTING(FontFaceImpl)
 
diff --git a/layout/style/moz.build b/layout/style/moz.build
index a14ab6a7ac..6e6a727abf 100644
--- a/layout/style/moz.build
+++ b/layout/style/moz.build
@@ -351,3 +351,6 @@ if CONFIG["COMPILE_ENVIRONMENT"]:
     CONFIGURE_SUBST_FILES += [
         "extra-bindgen-flags",
     ]
+
+# DOM Mask
+LOCAL_INCLUDES += ["/omegacfg"]
\ No newline at end of file