From a348162c5bc4c80144e3ff1595f383dcc3dd2518 Mon Sep 17 00:00:00 2001
From: Jonas Jenwald <jonas.jenwald@gmail.com>
Date: Tue, 7 Feb 2023 16:20:27 +0100
Subject: [PATCH] [GeckoView] Skip fetching/parsing of pageLabels

Currently there's no toolbar in the GV-viewer, hence invoking the pageLabels functionality isn't meaningful and just leads to unnecessary parsing on both the main- and worker-threads. (And if a toolbar is added at some point, it's not clear to me if we'd want to support pageLabels in the GV-viewer anyway.)
---
 web/app.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/web/app.js b/web/app.js
index ccc6b371d..54aafeaa6 100644
--- a/web/app.js
+++ b/web/app.js
@@ -1531,6 +1531,13 @@ const PDFViewerApplication = {
    * @private
    */
   async _initializePageLabels(pdfDocument) {
+    if (
+      typeof PDFJSDev === "undefined"
+        ? window.isGECKOVIEW
+        : PDFJSDev.test("GECKOVIEW")
+    ) {
+      return;
+    }
     const labels = await pdfDocument.getPageLabels();
 
     if (pdfDocument !== this.pdfDocument) {