diff --git a/web/packages/core/src/ruffle-player.ts b/web/packages/core/src/ruffle-player.ts
index 53c752a9d..d9eb9af60 100644
--- a/web/packages/core/src/ruffle-player.ts
+++ b/web/packages/core/src/ruffle-player.ts
@@ -1952,13 +1952,22 @@ export class RufflePlayer extends HTMLElement {
             this.isExtension &&
             window.location.origin !== this.swfUrl!.origin
         ) {
+            const url = new URL(this.swfUrl!);
+            if (this.loadedConfig?.parameters) {
+                const parameters = sanitizeParameters(
+                    this.loadedConfig.parameters
+                );
+                Object.entries(parameters).forEach(([key, value]) => {
+                    url.searchParams.set(key, value);
+                });
+            }
             this.hideSplashScreen();
             const div = document.createElement("div");
             div.id = "message_overlay";
             div.innerHTML = `<div class="message">
                 ${textAsParagraphs("message-cant-embed")}
                 <div>
-                    <a target="_blank" href="${this.swfUrl}">${text(
+                    <a target="_blank" href="${url}">${text(
                 "open-in-new-tab"
             )}</a>
                 </div>
diff --git a/web/packages/extension/src/player.ts b/web/packages/extension/src/player.ts
index f3f6d6053..cb3c855ef 100644
--- a/web/packages/extension/src/player.ts
+++ b/web/packages/extension/src/player.ts
@@ -29,9 +29,10 @@ window.addEventListener("DOMContentLoaded", async () => {
 
     player.load({
         ...options,
-        // Override default value for 'letterbox' when playing in the extension player page.
-        letterbox: "on" as Letterbox,
         url: swfUrl,
         base: swfUrl.substring(0, swfUrl.lastIndexOf("/") + 1),
+        // Override some default values when playing in the extension player page.
+        letterbox: "on" as Letterbox,
+        forceScale: true,
     });
 });