diff --git a/addon/chrome/content/preferences.xhtml b/addon/chrome/content/preferences.xhtml
index f6bc1b8..abb0f1e 100644
--- a/addon/chrome/content/preferences.xhtml
+++ b/addon/chrome/content/preferences.xhtml
@@ -6,35 +6,43 @@
onload="Zotero.__addonInstance__.hooks.onPrefsEvent('load', {window})"
>
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