diff --git a/chrome/content/scaffold/scaffold.xhtml b/chrome/content/scaffold/scaffold.xhtml
index 5e26552f60..e4942a6d91 100644
--- a/chrome/content/scaffold/scaffold.xhtml
+++ b/chrome/content/scaffold/scaffold.xhtml
@@ -354,21 +354,25 @@
 				titlebar-btn="min"
 				oncommand="window.minimize();"
 				data-l10n-id="browser-window-minimize-button"
+				aria-hidden="true"
 				/>
 			<toolbarbutton class="titlebar-button titlebar-max"
 				titlebar-btn="max"
 				oncommand="window.maximize();"
 				data-l10n-id="browser-window-maximize-button"
+				aria-hidden="true"
 				/>
 			<toolbarbutton class="titlebar-button titlebar-restore"
 				titlebar-btn="max"
 				oncommand="window.fullScreen ? BrowserFullScreen() : window.restore();"
 				data-l10n-id="browser-window-restore-down-button"
+				aria-hidden="true"
 				/>
 			<toolbarbutton class="titlebar-button titlebar-close"
 				titlebar-btn="close"
 				oncommand="window.close();"
 				data-l10n-id="browser-window-close-button"
+				aria-hidden="true"
 				/>
 		</hbox>
 	</vbox>
diff --git a/chrome/content/zotero/zoteroPane.xhtml b/chrome/content/zotero/zoteroPane.xhtml
index a2808516c1..cdf37e3088 100644
--- a/chrome/content/zotero/zoteroPane.xhtml
+++ b/chrome/content/zotero/zoteroPane.xhtml
@@ -818,18 +818,22 @@
 			<toolbarbutton class="titlebar-button titlebar-min"
 				oncommand="window.minimize();"
 				data-l10n-id="browser-window-minimize-button"
+				aria-hidden="true"
 				/>
 			<toolbarbutton class="titlebar-button titlebar-max"
 				oncommand="window.maximize();"
 				data-l10n-id="browser-window-maximize-button"
+				aria-hidden="true"
 				/>
 			<toolbarbutton class="titlebar-button titlebar-restore"
 				oncommand="window.fullScreen ? BrowserFullScreen() : window.restore();"
 				data-l10n-id="browser-window-restore-down-button"
+				aria-hidden="true"
 				/>
 			<toolbarbutton class="titlebar-button titlebar-close"
 				oncommand="window.close();"
 				data-l10n-id="browser-window-close-button"
+				aria-hidden="true"
 				/>
 		</hbox>
 	</vbox>