--- a/browser/base/content/browser-trackingprotection.js
+++ b/browser/base/content/browser-trackingprotection.js
@@ -138,16 +138,17 @@ var TrackingProtection = {
     Services.telemetry.getHistogramById("TRACKING_PROTECTION_SHIELD").add(value);
   },
 
   onSecurityChange(state, isSimulated) {
     let baseURI = this._baseURIForChannelClassifier;
 
     // Don't deal with about:, file: etc.
     if (!baseURI) {
+      this.icon.removeAttribute("state");
       return;
     }
 
     // Only animate the shield if the event was not fired directly from
     // the tabbrowser (due to a browser change).
     if (isSimulated) {
       this.icon.removeAttribute("animate");
     } else {