Remove suffix, don't alert on download cancel

history.js

@@ -4,6 +4,11 @@ const statusEl = document.getElementById("status");
 const listEl = document.getElementById("historyList");
 const clearHistoryBtn = document.getElementById("clearHistoryBtn");
 
+function isUserCancelledError(result) {
+  const error = result && typeof result.error === "string" ? result.error.toLowerCase() : "";
+  return error.includes("canceled by the user") || error.includes("cancelled by the user");
+}
+
 function formatMeta(entry) {
   const packName = entry && entry.packName ? entry.packName : "n/a";
   const key = entry && entry.key ? entry.key : "n/a";
@@ -105,6 +110,9 @@ function buildItem(entry) {
       entry
     });
     if (!result || !result.ok) {
+      if (isUserCancelledError(result)) {
+        return;
+      }
       window.alert((result && result.error) || "Download failed.");
       return;
     }