diff --git a/chrome/content/zotero/components/tabBar.jsx b/chrome/content/zotero/components/tabBar.jsx
index b3c0f7e916..98b1897ddb 100644
--- a/chrome/content/zotero/components/tabBar.jsx
+++ b/chrome/content/zotero/components/tabBar.jsx
@@ -386,6 +386,7 @@ const TabBar = forwardRef(function (props, ref) {
 					style={{ transform: Zotero.rtl ? 'scaleX(-1)' : undefined }}
 				>
 					<button
+						data-l10n-id="zotero-toolbar-tabs-scroll-backwards"
 						onClick={handleClickScrollStart}
 						onDoubleClick={handleScrollArrowDoubleClick}
 					>
@@ -420,6 +421,7 @@ const TabBar = forwardRef(function (props, ref) {
 					style={{ transform: Zotero.rtl ? 'scaleX(-1)' : undefined }}
 				>
 					<button
+						data-l10n-id="zotero-toolbar-tabs-scroll-forwards"
 						onClick={handleClickScrollEnd}
 						onDoubleClick={handleScrollArrowDoubleClick}
 					>
diff --git a/chrome/locale/en-US/zotero/zotero.ftl b/chrome/locale/en-US/zotero/zotero.ftl
index 7512b988ef..2ec703b7b6 100644
--- a/chrome/locale/en-US/zotero/zotero.ftl
+++ b/chrome/locale/en-US/zotero/zotero.ftl
@@ -149,6 +149,10 @@ zotero-tabs-menu-filter =
     .placeholder = Search Tabs
 zotero-tabs-menu-close-button =
     .title = Close Tab
+zotero-toolbar-tabs-scroll-forwards =
+    .title = Scroll forwards
+zotero-toolbar-tabs-scroll-backwards =
+    .title = Scroll backwards
 
 toolbar-add-attachment =
     .tooltiptext = { add-attachment }