This is the Basilisk version, which is believed to work for Albus Luna
as well.

--- albusluna.old/platform/toolkit/components/xulstore/XULStore.js
+++ albusluna/platform/toolkit/components/xulstore/XULStore.js
@@ -54,7 +54,7 @@
    *      ...
    *  }
    */
-  _data: {},
+  _data: {"chrome://browser/content/browser.xul":{"PersonalToolbar":{"currentset":"personal-bookmarks,ce_simplescreenshot,nosquint-button-enlarge,nosquint-button-reduce,reader-mode-button,savedpasswordeditor-button,uBlock0-legacy-button","mode":"icons","collapsed":"false"},"toolbar-menubar":{"autohide":"false"}}},
   _storeFile: null,
   _needsSaving: false,
   _saveAllowed: true,