From 1ca816d7247f5f7b3e53a7c9421d313f8e905731 Mon Sep 17 00:00:00 2001
From: Jonas Jenwald <jonas.jenwald@gmail.com>
Date: Sun, 14 Feb 2021 10:39:42 +0100
Subject: [PATCH] Directly use `requestIdleCallback` in `MOZCENTRAL`-builds

Given the following compatibility information, we really shouldn't need to check for the availability of `requestIdleCallback` in Firefox; see https://developer.mozilla.org/en-US/docs/Web/API/Window/requestIdleCallback#browser_compatibility
---
 web/app.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/web/app.js b/web/app.js
index 69a155a64..1435a4687 100644
--- a/web/app.js
+++ b/web/app.js
@@ -1423,7 +1423,10 @@ const PDFViewerApplication = {
       pdfViewer.optionalContentConfigPromise.then(optionalContentConfig => {
         this.pdfLayerViewer.render({ optionalContentConfig, pdfDocument });
       });
-      if ("requestIdleCallback" in window) {
+      if (
+        (typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")) ||
+        "requestIdleCallback" in window
+      ) {
         const callback = window.requestIdleCallback(
           () => {
             this._collectTelemetry(pdfDocument);