diff --git a/l10n/en-US/viewer.ftl b/l10n/en-US/viewer.ftl
index 25192fc038c3d..a40842a65fbe2 100644
--- a/l10n/en-US/viewer.ftl
+++ b/l10n/en-US/viewer.ftl
@@ -323,6 +323,9 @@ pdfjs-editor-ink-button-label = Draw
 pdfjs-editor-stamp-button =
     .title = Add or edit images
 pdfjs-editor-stamp-button-label = Add or edit images
+pdfjs-editor-highlight-button =
+    .title = Highlight
+pdfjs-editor-highlight-button-label = Highlight
 
 ## Remove button for the various kind of editor.
 
diff --git a/web/viewer.html b/web/viewer.html
index 892c071b4b26a..4eaf14bf67b66 100644
--- a/web/viewer.html
+++ b/web/viewer.html
@@ -342,8 +342,8 @@
               </div>
               <div id="toolbarViewerRight">
                 <div id="editorModeButtons" class="splitToolbarButton toggled" role="radiogroup">
-                  <button id="editorHighlight" class="toolbarButton" hidden="true" disabled="disabled" title="Highlight" role="radio" aria-checked="false" aria-controls="editorHighlightParamsToolbar" tabindex="31" data-l10n-id="pdfjs-editor-highlight">
-                    <span data-l10n-id="pdfjs-editor-highlight-label">Highlight</span>
+                  <button id="editorHighlight" class="toolbarButton" hidden="true" disabled="disabled" title="Highlight" role="radio" aria-checked="false" aria-controls="editorHighlightParamsToolbar" tabindex="31" data-l10n-id="pdfjs-editor-highlight-button">
+                    <span data-l10n-id="pdfjs-editor-highlight-button-label">Highlight</span>
                   </button>
                   <button id="editorFreeText" class="toolbarButton" disabled="disabled" title="Text" role="radio" aria-checked="false" aria-controls="editorFreeTextParamsToolbar" tabindex="32" data-l10n-id="pdfjs-editor-free-text-button">
                     <span data-l10n-id="pdfjs-editor-free-text-button-label">Text</span>