diff --git a/web/viewer.css b/web/viewer.css
index 78cb845e2..14aaf1773 100644
--- a/web/viewer.css
+++ b/web/viewer.css
@@ -531,13 +531,18 @@ select {
 .editorParamsToolbarContainer .editorParamsSlider::-moz-range-progress {
   background-color: black;
 }
-.editorParamsToolbarContainer .editorParamsSlider::-moz-range-track,
-.editorParamsToolbarContainer
-  .editorParamsSlider::-webkit-slider-runnable-track {
+
+/*#if !MOZCENTRAL*/
+.editorParamsToolbarContainer .editorParamsSlider::-webkit-slider-runnable-track,
+/*#endif*/
+.editorParamsToolbarContainer .editorParamsSlider::-moz-range-track {
   background-color: black;
 }
-.editorParamsToolbarContainer .editorParamsSlider::-moz-range-thumb,
-.editorParamsToolbarContainer .editorParamsSlider::-webkit-slider-thumb {
+
+/*#if !MOZCENTRAL*/
+.editorParamsToolbarContainer .editorParamsSlider::-webkit-slider-thumb,
+/*#endif*/
+.editorParamsToolbarContainer .editorParamsSlider::-moz-range-thumb {
   background-color: white;
 }