diff --git a/galaxy.js b/galaxy.js
index 71ae7a7..1d7932d 100644
--- a/galaxy.js
+++ b/galaxy.js
@@ -124,8 +124,9 @@ export function initGalaxy({
     onLoggedInChanged
 }) {
     return new Promise((accept, reject) => {
-        acceptedOrigins = acceptedOrigins ?? ["https://galaxy.click/"];
-        if (acceptedOrigins.includes(document.referrer)) {
+        acceptedOrigins = acceptedOrigins.map(url =>
+            url.replace(/\/?$/, '/')) ?? ["https://galaxy.click/"];
+        if (acceptedOrigins.includes(document.referrer.replace(/\/?$/, '/'))) {
             // Callbacks to resolve promises
             /** @type function(SaveListResponse["list"]):void */
             let saveListAccept,
@@ -180,7 +181,7 @@ export function initGalaxy({
             };
 
             window.addEventListener("message", e => {
-                if (e.origin === galaxy.origin) {
+                if (e.origin.replace(/\/?$/, '/') === galaxy.origin.replace(/\/?$/, '/')) {
                     console.log("Received message from Galaxy", e.data);
                     /** @type GalaxyResponse */
                     const data = e.data;