diff --git a/web/app.js b/web/app.js
index 36ef5d47a..6014948eb 100644
--- a/web/app.js
+++ b/web/app.js
@@ -870,10 +870,10 @@ const PDFViewerApplication = {
 
   setTitleUsingUrl(url = "", downloadUrl = null) {
     this.url = url;
-    this.baseUrl = url.split("#")[0];
+    this.baseUrl = url.split("#", 1)[0];
     if (downloadUrl) {
       this._downloadUrl =
-        downloadUrl === url ? this.baseUrl : downloadUrl.split("#")[0];
+        downloadUrl === url ? this.baseUrl : downloadUrl.split("#", 1)[0];
     }
     if (isDataScheme(url)) {
       this._hideViewBookmark();
@@ -1020,20 +1020,20 @@ const PDFViewerApplication = {
         /* downloadUrl = */ args.url
       );
     }
+    // Always set `docBaseUrl` in development mode, and in the (various)
+    // extension builds.
+    if (typeof PDFJSDev === "undefined") {
+      AppOptions.set("docBaseUrl", document.URL.split("#", 1)[0]);
+    } else if (PDFJSDev.test("MOZCENTRAL || CHROME")) {
+      AppOptions.set("docBaseUrl", this.baseUrl);
+    }
+
     // Set the necessary API parameters, using all the available options.
     const apiParams = AppOptions.getAll(OptionKind.API);
-    const params = {
-      canvasMaxAreaInBytes: AppOptions.get("canvasMaxAreaInBytes"),
+    const loadingTask = getDocument({
       ...apiParams,
       ...args,
-    };
-
-    if (typeof PDFJSDev === "undefined") {
-      params.docBaseUrl ||= document.URL.split("#")[0];
-    } else if (PDFJSDev.test("MOZCENTRAL || CHROME")) {
-      params.docBaseUrl ||= this.baseUrl;
-    }
-    const loadingTask = getDocument(params);
+    });
     this.pdfLoadingTask = loadingTask;
 
     loadingTask.onPassword = (updateCallback, reason) => {
@@ -1252,7 +1252,7 @@ const PDFViewerApplication = {
     this.secondaryToolbar?.setPagesCount(pdfDocument.numPages);
 
     if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("CHROME")) {
-      const baseUrl = location.href.split("#")[0];
+      const baseUrl = location.href.split("#", 1)[0];
       // Ignore "data:"-URLs for performance reasons, even though it may cause
       // internal links to not work perfectly in all cases (see bug 1803050).
       this.pdfLinkService.setDocument(
diff --git a/web/app_options.js b/web/app_options.js
index 970b0ba83..dbde2ed7b 100644
--- a/web/app_options.js
+++ b/web/app_options.js
@@ -57,7 +57,7 @@ const defaultOptions = {
   canvasMaxAreaInBytes: {
     /** @type {number} */
     value: -1,
-    kind: OptionKind.BROWSER,
+    kind: OptionKind.BROWSER + OptionKind.API,
   },
   isInAutomation: {
     /** @type {boolean} */