From 48c64c6c8d2323251c83589b0b59499e9c72c72d Mon Sep 17 00:00:00 2001
From: Jonas Jenwald <jonas.jenwald@gmail.com>
Date: Mon, 28 Feb 2022 21:24:38 +0100
Subject: [PATCH] Bug 1757527 - Slightly reduce (repeated) message passing
 overhead when localizing the PDF Viewer

---
 extensions/firefox/tools/l10n.js | 12 +++++++-----
 web/firefoxcom.js                |  2 +-
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/extensions/firefox/tools/l10n.js b/extensions/firefox/tools/l10n.js
index 383764512..7cc43dc8e 100644
--- a/extensions/firefox/tools/l10n.js
+++ b/extensions/firefox/tools/l10n.js
@@ -2,14 +2,16 @@
 
 // Small subset of the webL10n API by Fabien Cazenave for PDF.js extension.
 (function (window) {
-  var gLanguage = "";
-  var gExternalLocalizerServices = null;
-  var gReadyState = "loading";
+  let gL10nData = null;
+  let gLanguage = "";
+  let gExternalLocalizerServices = null;
+  let gReadyState = "loading";
 
   // fetch an l10n objects
   function getL10nData(key) {
-    var response = gExternalLocalizerServices.getStrings(key);
-    var data = JSON.parse(response);
+    gL10nData ||= gExternalLocalizerServices.getStrings();
+
+    const data = gL10nData?.[key];
     if (!data) {
       console.warn("[l10n] #" + key + " missing for [" + gLanguage + "]");
     }
diff --git a/web/firefoxcom.js b/web/firefoxcom.js
index 7b3123260..aa9c87654 100644
--- a/web/firefoxcom.js
+++ b/web/firefoxcom.js
@@ -437,7 +437,7 @@ document.mozL10n.setExternalLocalizerServices({
   },
 
   getStrings(key) {
-    return FirefoxCom.requestSync("getStrings", key);
+    return FirefoxCom.requestSync("getStrings", null);
   },
 });