diff --git a/web/app.js b/web/app.js
index 2c5a120aa..920c95bde 100644
--- a/web/app.js
+++ b/web/app.js
@@ -685,7 +685,9 @@ const PDFViewerApplication = {
         this._hideViewBookmark();
       }
     } else if (PDFJSDev.test("MOZCENTRAL || CHROME")) {
-      this.initPassiveLoading(file);
+      this.setTitleUsingUrl(file, /* downloadUrl = */ file);
+
+      this.externalServices.initPassiveLoading();
     } else {
       throw new Error("Not implemented: run");
     }
@@ -815,37 +817,6 @@ const PDFViewerApplication = {
     this._caretBrowsing.moveCaret(isUp, select);
   },
 
-  initPassiveLoading(file) {
-    if (
-      typeof PDFJSDev === "undefined" ||
-      !PDFJSDev.test("MOZCENTRAL || CHROME")
-    ) {
-      throw new Error("Not implemented: initPassiveLoading");
-    }
-    this.setTitleUsingUrl(file, /* downloadUrl = */ file);
-
-    this.externalServices.initPassiveLoading({
-      onOpenWithTransport: range => {
-        this.open({ range });
-      },
-      onOpenWithData: (data, contentDispositionFilename) => {
-        if (isPdfFile(contentDispositionFilename)) {
-          this._contentDispositionFilename = contentDispositionFilename;
-        }
-        this.open({ data });
-      },
-      onOpenWithURL: (url, length, originalUrl) => {
-        this.open({ url, length, originalUrl });
-      },
-      onError: err => {
-        this._documentError("pdfjs-loading-error", err);
-      },
-      onProgress: (loaded, total) => {
-        this.progress(loaded / total);
-      },
-    });
-  },
-
   setTitleUsingUrl(url = "", downloadUrl = null) {
     this.url = url;
     this.baseUrl = url.split("#", 1)[0];
@@ -987,10 +958,11 @@ const PDFViewerApplication = {
     const workerParams = AppOptions.getAll(OptionKind.WORKER);
     Object.assign(GlobalWorkerOptions, workerParams);
 
-    if (
-      (typeof PDFJSDev === "undefined" || !PDFJSDev.test("MOZCENTRAL")) &&
-      args.url
-    ) {
+    if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")) {
+      if (args.data && isPdfFile(args.filename)) {
+        this._contentDispositionFilename = args.filename;
+      }
+    } else if (args.url) {
       // The Firefox built-in viewer always calls `setTitleUsingUrl`, before
       // `initPassiveLoading`, and it never provides an `originalUrl` here.
       this.setTitleUsingUrl(
diff --git a/web/chromecom.js b/web/chromecom.js
index 5a4ebfbf5..7f26b70db 100644
--- a/web/chromecom.js
+++ b/web/chromecom.js
@@ -417,12 +417,11 @@ class Preferences extends BasePreferences {
 }
 
 class ExternalServices extends BaseExternalServices {
-  initPassiveLoading(callbacks) {
-    // defaultUrl is set in viewer.js
+  initPassiveLoading() {
     ChromeCom.resolvePDFFile(
       AppOptions.get("defaultUrl"),
       function (url, length, originalUrl) {
-        callbacks.onOpenWithURL(url, length, originalUrl);
+        viewerApp.open({ url, length, originalUrl });
       }
     );
   }
diff --git a/web/external_services.js b/web/external_services.js
index 1fa42cd43..509e08470 100644
--- a/web/external_services.js
+++ b/web/external_services.js
@@ -24,7 +24,7 @@ class BaseExternalServices {
 
   updateFindMatchesCount(data) {}
 
-  initPassiveLoading(callbacks) {}
+  initPassiveLoading() {}
 
   reportTelemetry(data) {}
 
diff --git a/web/firefoxcom.js b/web/firefoxcom.js
index ecced7836..bb1b5f46f 100644
--- a/web/firefoxcom.js
+++ b/web/firefoxcom.js
@@ -323,7 +323,7 @@ class ExternalServices extends BaseExternalServices {
     FirefoxCom.request("updateFindMatchesCount", data);
   }
 
-  initPassiveLoading(callbacks) {
+  initPassiveLoading() {
     let pdfDataRangeTransport;
 
     window.addEventListener("message", function windowMessage(e) {
@@ -340,7 +340,7 @@ class ExternalServices extends BaseExternalServices {
       switch (args.pdfjsLoadAction) {
         case "supportsRangedLoading":
           if (args.done && !args.data) {
-            callbacks.onError();
+            viewerApp._documentError(null);
             break;
           }
           pdfDataRangeTransport = new FirefoxComDataRangeTransport(
@@ -350,7 +350,7 @@ class ExternalServices extends BaseExternalServices {
             args.filename
           );
 
-          callbacks.onOpenWithTransport(pdfDataRangeTransport);
+          viewerApp.open({ range: pdfDataRangeTransport });
           break;
         case "range":
           pdfDataRangeTransport.onDataRange(args.begin, args.chunk);
@@ -369,14 +369,14 @@ class ExternalServices extends BaseExternalServices {
           pdfDataRangeTransport?.onDataProgressiveDone();
           break;
         case "progress":
-          callbacks.onProgress(args.loaded, args.total);
+          viewerApp.progress(args.loaded / args.total);
           break;
         case "complete":
           if (!args.data) {
-            callbacks.onError(args.errorCode);
+            viewerApp._documentError(null, { message: args.errorCode });
             break;
           }
-          callbacks.onOpenWithData(args.data, args.filename);
+          viewerApp.open({ data: args.data, filename: args.filename });
           break;
       }
     });