--- a/mail/base/content/commandglue.js
+++ b/mail/base/content/commandglue.js
@@ -139,17 +139,28 @@ function UpdateStatusQuota(folder) {
   if (!(folder && folder instanceof Ci.nsIMsgImapMailFolder)) {
     document.getElementById("quotaPanel").hidden = true;
     return;
   }
 
   let quotaUsagePercentage = q =>
     Number((100n * BigInt(q.usage)) / BigInt(q.limit));
 
-  let folderQuota = folder.getQuota();
+  // For display on main window panel only include quota names containing
+  // "STORAGE" or "MESSAGE". This will exclude unusual quota names containing
+  // items like "MAILBOX" and "LEVEL" from the panel bargraph. All quota names
+  // will still appear on the folder properties quota window.
+  // Note: Quota name is typically something like "User Quota / STORAGE".
+  let folderQuota = folder
+    .getQuota()
+    .filter(
+      quota =>
+        quota.name.toUpperCase().includes("STORAGE") ||
+        quota.name.toUpperCase().includes("MESSAGE")
+    );
   // If folderQuota not empty, find the index of the element with highest
   //  percent usage and determine if it is above the panel display threshold.
   if (folderQuota.length > 0) {
     let highest = folderQuota.reduce((acc, current) =>
       quotaUsagePercentage(acc) > quotaUsagePercentage(current) ? acc : current
     );
     let percent = quotaUsagePercentage(highest);
     if (