diff --git a/src/content-handlers/iiif/extensions/uv-openseadragon-extension/DownloadDialogue.tsx b/src/content-handlers/iiif/extensions/uv-openseadragon-extension/DownloadDialogue.tsx
index aa129f3c6..8d8d02e10 100644
--- a/src/content-handlers/iiif/extensions/uv-openseadragon-extension/DownloadDialogue.tsx
+++ b/src/content-handlers/iiif/extensions/uv-openseadragon-extension/DownloadDialogue.tsx
@@ -496,7 +496,7 @@ const DownloadDialogue = ({
     defaultLabel: string;
     type: DownloadOption;
   }) {
-    const renderings: Rendering[] = resource.getRenderings();
+    const renderings: Rendering[] = getSafeRenderings(resource.getRenderings());
 
     return (
       <>
@@ -539,10 +539,23 @@ const DownloadDialogue = ({
   //   return resource.getRenderings().length > 0;
   // }
 
+  function isSafeRenderingUri(uri) {
+    try {
+      const parsed = new URL(uri, window.location.href);
+      return ["http:", "https:"].includes(parsed.protocol);
+    } catch {
+      return false;
+    }
+  }
+
+  function getSafeRenderings(renderings: Rendering[]): Rendering[] {
+    return renderings.filter((r: Rendering) => isSafeRenderingUri(r.id));
+  }
+
   function hasRangeRenderings(): boolean {
     const canvas: Canvas = getSelectedCanvas();
     return (canvas.ranges ?? []).some(
-      (range: Range) => range.getRenderings().length > 0
+      (range: Range) => getSafeRenderings(range.getRenderings()).length > 0
     );
   }
 
@@ -566,9 +579,9 @@ const DownloadDialogue = ({
   function hasImageRenderings() {
     const canvas: Canvas = getSelectedCanvas();
     const images: Annotation[] = canvas.getImages();
-
     return images.some(
-      (image: Annotation) => image.getResource().getRenderings().length > 0
+      (image: Annotation) =>
+        getSafeRenderings(image.getResource().getRenderings()).length > 0
     );
   }
 
@@ -592,7 +605,7 @@ const DownloadDialogue = ({
 
   function hasCanvasRenderings() {
     const canvas: Canvas = getSelectedCanvas();
-    return canvas.getRenderings().length > 0;
+    return getSafeRenderings(canvas.getRenderings()).length > 0;
   }
 
   function CanvasRenderings() {
@@ -609,7 +622,8 @@ const DownloadDialogue = ({
 
   function hasManifestRenderings(): boolean {
     return (
-      sequence.getRenderings().length > 0 || manifest.getRenderings().length > 0
+      getSafeRenderings(sequence.getRenderings()).length > 0 ||
+      getSafeRenderings(manifest.getRenderings()).length > 0
     );
   }
 
diff --git a/src/content-handlers/iiif/modules/uv-dialogues-module/DownloadDialogue.ts b/src/content-handlers/iiif/modules/uv-dialogues-module/DownloadDialogue.ts
index 8f35b1ded..fbca13b37 100644
--- a/src/content-handlers/iiif/modules/uv-dialogues-module/DownloadDialogue.ts
+++ b/src/content-handlers/iiif/modules/uv-dialogues-module/DownloadDialogue.ts
@@ -91,6 +91,15 @@ export class DownloadDialogue extends Dialogue<
     this.updateTermsOfUseButton();
   }
 
+  isSafeRenderingUri(uri) {
+    try {
+      const parsed = new URL(uri, window.location.href);
+      return ["http:", "https:"].includes(parsed.protocol);
+    } catch {
+      return false;
+    }
+  }
+
   addEntireFileDownloadOptions(): void {
     if (
       this.isDownloadOptionAvailable(DownloadOption.ENTIRE_FILE_AS_ORIGINAL)
@@ -104,7 +113,9 @@ export class DownloadDialogue extends Dialogue<
 
       let renderingFound: boolean = false;
 
-      const renderings: Rendering[] = canvas.getRenderings();
+      const renderings: Rendering[] = canvas
+        .getRenderings()
+        .filter((r: Rendering) => this.isSafeRenderingUri(r.id));
 
       for (let i = 0; i < renderings.length; i++) {
         const rendering: Rendering = renderings[i];
@@ -113,6 +124,7 @@ export class DownloadDialogue extends Dialogue<
         if (renderingFormat) {
           format = renderingFormat.toString();
         }
+
         this.addEntireFileDownloadOption(
           rendering.id,
           <string>LanguageMap.getValue(rendering.getLabel()),
@@ -130,7 +142,7 @@ export class DownloadDialogue extends Dialogue<
           const annotation: Annotation = annotations[i];
           const body: AnnotationBody[] = annotation.getBody();
 
-          if (body.length) {
+          if (body.length && this.isSafeRenderingUri(body[0].id)) {
             const format: MediaType | null = body[0].getFormat();
 
             if (format) {
@@ -172,13 +184,16 @@ export class DownloadDialogue extends Dialogue<
       label += " (" + fileType + ")";
     }
 
-    this.$downloadOptions.append(
-      '<li><a href="' +
-        uri +
-        '" target="_blank" download tabindex="0">' +
-        label +
-        "</li>"
-    );
+    const $link = $("<a>", {
+      href: uri,
+      target: "_blank",
+      download: "",
+      tabindex: "0",
+      text: label,
+    });
+
+    const $li = $("<li>").append($link);
+    this.$downloadOptions.append($li);
   }
 
   resetDynamicDownloadOptions(): void {
@@ -192,7 +207,9 @@ export class DownloadDialogue extends Dialogue<
     defaultLabel: string,
     type: DownloadOption
   ): IRenderingOption[] {
-    const renderings: Rendering[] = resource.getRenderings();
+    const renderings: Rendering[] = resource
+      .getRenderings()
+      .filter((r: Rendering) => this.isSafeRenderingUri(r.id));
 
     const downloadOptions: any[] = [];