diff --git a/web/app_options.js b/web/app_options.js
index f0a5491e3..79d8e5f61 100644
--- a/web/app_options.js
+++ b/web/app_options.js
@@ -284,8 +284,11 @@ const defaultOptions = {
   workerSrc: {
     /** @type {string} */
     value:
+      // eslint-disable-next-line no-nested-ternary
       typeof PDFJSDev === "undefined" || !PDFJSDev.test("PRODUCTION")
         ? "../src/worker_loader.js"
+        : PDFJSDev.test("MOZCENTRAL")
+        ? "resource://pdf.js/build/pdf.worker.js"
         : "../build/pdf.worker.js",
     kind: OptionKind.WORKER,
   },
diff --git a/web/viewer-geckoview.html b/web/viewer-geckoview.html
index f96eb3b95..03f3f64b0 100644
--- a/web/viewer-geckoview.html
+++ b/web/viewer-geckoview.html
@@ -31,7 +31,7 @@ See https://github.com/adobe-type-tools/cmap-resources
 <!--#endif-->
 
 <!--#if MOZCENTRAL-->
-<!--<link rel="stylesheet" href="viewer.css">-->
+<!--<link rel="stylesheet" href="resource://pdf.js/web/viewer.css">-->
 <!--#else-->
 <link rel="stylesheet" href="viewer-geckoview.css">
 <!--#endif-->
@@ -71,7 +71,7 @@ See https://github.com/adobe-type-tools/cmap-resources
 
     <script src="viewer-geckoview.js" type="module-shim"></script>
 <!--#else-->
-<!--<script src="viewer.js"></script>-->
+<!--<script src="resource://pdf.js/web/viewer.js"></script>-->
 <!--#endif-->
 
   </head>
diff --git a/web/viewer-snippet-firefox-extension.html b/web/viewer-snippet-firefox-extension.html
index b153febfa..c7c416d50 100644
--- a/web/viewer-snippet-firefox-extension.html
+++ b/web/viewer-snippet-firefox-extension.html
@@ -1,3 +1,2 @@
 <!-- This snippet is used in the Firefox extension (included from viewer.html) -->
-<base href="resource://pdf.js/web/">
-<script src="../build/pdf.js"></script>
+<script src="resource://pdf.js/build/pdf.js"></script>
diff --git a/web/viewer.html b/web/viewer.html
index 112083dbf..582c7ee4d 100644
--- a/web/viewer.html
+++ b/web/viewer.html
@@ -36,7 +36,12 @@ See https://github.com/adobe-type-tools/cmap-resources
 <!--#include viewer-snippet-chrome-extension.html-->
 <!--#endif-->
 
+<!--#if MOZCENTRAL-->
+<!--<link rel="stylesheet" href="resource://pdf.js/web/viewer.css">-->
+<!--#else-->
     <link rel="stylesheet" href="viewer.css">
+<!--#endif-->
+
 <!--#if !PRODUCTION-->
     <link rel="resource" type="application/l10n" href="locale/locale.properties">
 <!--#endif-->
@@ -77,10 +82,12 @@ See https://github.com/adobe-type-tools/cmap-resources
 <!--#include viewer-snippet.html-->
 <!--#endif-->
 
-<!--#if !MINIFIED -->
-<!--<script src="viewer.js"></script>-->
-<!--#else-->
+<!--#if MINIFIED-->
 <!--#include viewer-snippet-minified.html-->
+<!--#elif MOZCENTRAL-->
+<!--<script src="resource://pdf.js/web/viewer.js"></script>-->
+<!--#else-->
+<!--<script src="viewer.js"></script>-->
 <!--#endif-->
 
   </head>