diff --git a/content/treestyletab/res/tabFx2Compatible.css b/content/treestyletab/res/tabFx2Compatible.css
index 1cdb1dd9..e8e4bae7 100644
--- a/content/treestyletab/res/tabFx2Compatible.css
+++ b/content/treestyletab/res/tabFx2Compatible.css
@@ -24,13 +24,13 @@
 	-moz-binding: url(tabFx2Compatible.xml#tabbrowser-tab-4) !important;
 }
 
-:root[tabFx2Compatible="9"]:not([tabFx2Compatible-flags~="png-throbber"])
+:root[tabFx2Compatible="9"]:not([tabFx2Compatible-flags~="png-throbber"]):not([tabFx2Compatible-flags~="pie"])
   .tab-icon-image[busy] {
 	list-style-image: url("chrome://global/skin/throbber/Throbber-small.gif") !important;
 	opacity: 0.6;
 }
 
-:root[tabFx2Compatible="9"][tabFx2Compatible-flags~="png-throbber"]
+:root[tabFx2Compatible="9"][tabFx2Compatible-flags~="png-throbber"]:not([tabFx2Compatible-flags~="pie"])
   .tab-icon-image[busy] {
 	list-style-image: url("chrome://global/skin/icons/loading_16.png") !important;
 }
@@ -45,16 +45,6 @@
 	opacity: 0.6;
 }
 
-:root[tabFx2Compatible="9"][tabFx2Compatible-flags~="pie"]
-  .tab-icon-image[busy] {
-	list-style-image: url("chrome://browser/skin/tabbrowser/progress.png") !important;
-	-moz-image-region: rect(0, 16px, 16px, 0);
-}
-:root[tabFx2Compatible="9"][tabFx2Compatible-flags~="pie"]
-  .tab-icon-image[busy][stalled] {
-	list-style-image: url("chrome://browser/skin/tabbrowser/progress-pulsing.png") !important;
-}
-
 :root[tabFx2Compatible="9"]
   .tabbrowser-tab:focus > .tab-stack {
 	border: 1px dotted -moz-DialogText;