diff --git a/dom/canvas/WebGLContextExtensions.cpp b/dom/canvas/WebGLContextExtensions.cpp
index 7992e12b2d03..c6c29850a54c 100644
--- a/dom/canvas/WebGLContextExtensions.cpp
+++ b/dom/canvas/WebGLContextExtensions.cpp
@@ -112,6 +112,8 @@ WebGLContext::IsExtensionSupported(WebGLExtensionID ext) const
     switch (ext) {
     // In alphabetical order
     // EXT_
+    case WebGLExtensionID::EXT_disjoint_timer_query:
+        return WebGLExtensionDisjointTimerQuery::IsSupported(this);
     case WebGLExtensionID::EXT_texture_filter_anisotropic:
         return gl->IsExtensionSupported(gl::GLContext::EXT_texture_filter_anisotropic);
 
@@ -211,14 +213,13 @@ WebGLContext::IsExtensionSupported(WebGLExtensionID ext) const
         }
 
         if (gfxPrefs::WebGLDraftExtensionsEnabled()) {
+            /*
             switch (ext) {
-            case WebGLExtensionID::EXT_disjoint_timer_query:
-                return WebGLExtensionDisjointTimerQuery::IsSupported(this);
-
             default:
                 // For warnings-as-errors.
                 break;
             }
+            */
         }
     }