diff --git a/src/core/operations/FromFirefoxBrowserTimeStamp.mjs b/src/core/operations/FromFirefoxBrowserTimeStamp.mjs
index aabf2807..db028a48 100644
--- a/src/core/operations/FromFirefoxBrowserTimeStamp.mjs
+++ b/src/core/operations/FromFirefoxBrowserTimeStamp.mjs
@@ -5,7 +5,6 @@
  */
 
 import Operation from "../Operation.mjs";
-import OperationError from "../errors/OperationError.mjs";
 import moment from "moment-timezone";
 
 /**