--- a/gfx/gl/GLContext.cpp
+++ b/gfx/gl/GLContext.cpp
@@ -789,30 +789,30 @@ GLContext::InitWithPrefix(const char *pr
             if (!LoadSymbols(useCore ? coreSymbols : extSymbols, trygl, prefix)) {
                 NS_ERROR("GL supports framebuffer_multisample without supplying glRenderbufferStorageMultisample");
 
                 MarkUnsupported(GLFeature::framebuffer_multisample);
                 ClearSymbols(coreSymbols);
             }
         }
 
-        if (IsExtensionSupported(ARB_sync)) {
+        if (IsSupported(GLFeature::sync)) {
             SymLoadStruct syncSymbols[] = {
                 { (PRFuncPtr*) &mSymbols.fFenceSync,      { "FenceSync",      nullptr } },
                 { (PRFuncPtr*) &mSymbols.fIsSync,         { "IsSync",         nullptr } },
                 { (PRFuncPtr*) &mSymbols.fDeleteSync,     { "DeleteSync",     nullptr } },
                 { (PRFuncPtr*) &mSymbols.fClientWaitSync, { "ClientWaitSync", nullptr } },
                 { (PRFuncPtr*) &mSymbols.fWaitSync,       { "WaitSync",       nullptr } },
                 { (PRFuncPtr*) &mSymbols.fGetInteger64v,  { "GetInteger64v",  nullptr } },
                 { (PRFuncPtr*) &mSymbols.fGetSynciv,      { "GetSynciv",      nullptr } },
                 END_SYMBOLS
             };
 
             if (!LoadSymbols(&syncSymbols[0], trygl, prefix)) {
-                NS_ERROR("GL supports ARB_sync without supplying its functions.");
+                NS_ERROR("GL supports sync without supplying its functions.");
 
                 MarkExtensionUnsupported(ARB_sync);
                 ClearSymbols(syncSymbols);
             }
         }
 
         if (IsExtensionSupported(OES_EGL_image)) {
             SymLoadStruct extSymbols[] = {

--- a/gfx/gl/GLContext.h
+++ b/gfx/gl/GLContext.h
@@ -117,16 +117,17 @@ enum class GLFeature {
     read_buffer,
     renderbuffer_color_float,
     renderbuffer_color_half_float,
     robustness,
     sRGB_framebuffer,
     sRGB_texture,
     sampler_objects,
     standard_derivatives,
+    sync,
     texture_3D,
     texture_3D_compressed,
     texture_3D_copy,
     texture_float,
     texture_float_linear,
     texture_half_float,
     texture_half_float_linear,
     texture_non_power_of_two,

--- a/gfx/gl/GLContextFeatures.cpp
+++ b/gfx/gl/GLContextFeatures.cpp
@@ -525,16 +525,25 @@ static const FeatureInfo sFeatureInfoArr
         GLESVersion::ES3,
         GLContext::Extension_None,
         {
             GLContext::OES_standard_derivatives,
             GLContext::Extensions_End
         }
     },
     {
+        "sync",
+        GLVersion::GL3_2,
+        GLESVersion::ES3,
+        GLContext::ARB_sync,
+        {
+            GLContext::Extensions_End
+        }
+    },
+    {
         "texture_3D",
         GLVersion::GL1_2,
         GLESVersion::ES3,
         GLContext::Extension_None,
         {
             GLContext::EXT_texture3D,
             GLContext::OES_texture_3D,
             GLContext::Extensions_End