diff --git a/app/ui.js b/app/ui.js
index 2eb6eb7b..0e65ba94 100644
--- a/app/ui.js
+++ b/app/ui.js
@@ -949,6 +949,7 @@ const UI = {
     // further information at https://developer.mozilla.org/en-US/docs/Web/API/Clipboard
 
     writeLocalClipboard(text) {
+        Log.Debug(">> UI.writeLocalClipboard: " + text.substr(0, 40) + "...");
         if (typeof navigator.clipboard !== "undefined" && typeof navigator.clipboard.writeText !== "undefined" &&
           typeof navigator.permissions !== "undefined" && typeof navigator.permissions.query !== "undefined"
         ) {
@@ -964,9 +965,11 @@ const UI = {
                     }
                 });
         }
+        Log.Debug("<< UI.writeLocalClipboard");
     },
 
     readLocalClipboard() {
+        Log.Debug(">> UI.readLocalClipboard");
         // navigator.clipboard and navigator.clipbaord.readText is not available in all browsers
         if (typeof navigator.clipboard !== "undefined" && typeof navigator.clipboard.readText !== "undefined" &&
           typeof navigator.permissions !== "undefined" && typeof navigator.permissions.query !== "undefined"
@@ -986,6 +989,7 @@ const UI = {
                     }
                 });
         }
+        Log.Debug("<< UI.readLocalClipboard");
     },
     openClipboardPanel() {
         UI.closeAllPanels();
diff --git a/core/util/logging.js b/core/util/logging.js
index fe449e93..4d8db779 100644
--- a/core/util/logging.js
+++ b/core/util/logging.js
@@ -10,12 +10,43 @@
  * Logging/debug routines
  */
 
+
 let _logLevel = 'warn';
 
+function safeJoin(input, delimiter) {
+    if (!Array.isArray(input)) {
+        return '';
+    }
+    const output = [];
+    // eslint-disable-next-line
+    for (let i = 0; i < input.length; i++) {
+        const value = input[i];
+        try {
+            output.push(String(value));
+        } catch (e) {
+            output.push('[value cannot be serialized]');
+        }
+    }
+    return output.join(delimiter);
+}
+
+const defaultErrorFunc = (...args) => {
+    if (!window.Sentry) {
+        return;
+    }
+    const extra = {arguments: args};
+    if (args[0] instanceof Error) {
+        window.Sentry.captureException(args[0], {extra});
+        return;
+    }
+    let message = safeJoin(args, ' ');
+    window.Sentry.captureMessage(message);
+};
+
 let Debug = () => {};
 let Info = () => {};
 let Warn = () => {};
-let Error = () => {};
+let Error = defaultErrorFunc;
 
 export function initLogging(level) {
     if (typeof level === 'undefined') {
@@ -24,7 +55,8 @@ export function initLogging(level) {
         _logLevel = level;
     }
 
-    Debug = Info = Warn = Error = () => {};
+    Debug = Info = Warn = () => {};
+    Error = defaultErrorFunc;
 
     if (typeof window.console !== "undefined") {
         /* eslint-disable no-console, no-fallthrough */
@@ -36,7 +68,10 @@ export function initLogging(level) {
             case 'warn':
                 Warn  = console.warn.bind(window.console);
             case 'error':
-                Error = console.error.bind(window.console);
+                Error = (...args) => {
+                    console.error(...args);
+                    defaultErrorFunc(...args);
+                };
             case 'none':
                 break;
             default:
diff --git a/uploadToS3.sh b/uploadToS3.sh
index 8291dd11..b12d67b2 100755
--- a/uploadToS3.sh
+++ b/uploadToS3.sh
@@ -5,6 +5,7 @@ s3Key=$1
 s3Secret=$2
 tag=$3
 folder="noVNC"
+cdn="\/\/static-assets.codio.com\/${folder}\/${tag}"
 
 replaceHtmlUrls () {
   sed -i "s/$1/$2/" "./vnc.html"
@@ -14,11 +15,15 @@ replaceTagVersion () {
   sed -i "s/TAG_VERSION/${tag}/" "./vnc.html"
 }
 
-prepareHtml () {
-  cdn="\/\/static-assets.codio.com\/${folder}\/${tag}"
+replaceJsUrls () {
+  sed -i "s/\.\/package\.json/${cdn}\/package\.json/" "./app/ui.js"
+}
+
+prepareSources () {
   replaceHtmlUrls "href=\"app\/" "href=\"${cdn}\/app\/"
   replaceHtmlUrls "src=\"app\/" "src=\"${cdn}\/app\/"
   replaceTagVersion
+  replaceJsUrls
 }
 
 readarray -d '' files < <(find ./ -type f -print0)
@@ -65,7 +70,7 @@ uploadFile () {
     https://${bucket}.s3.amazonaws.com/"${folder}"/"${tag}"/"${fName}" || exit 1
 }
 
-prepareHtml
+prepareSources
 
 for file in "${files[@]}"
 do
diff --git a/vnc.html b/vnc.html
index 4258980d..9ceaa6de 100644
--- a/vnc.html
+++ b/vnc.html
@@ -56,7 +56,10 @@
                 // No need to configure DSN here, it is already configured in the loader script
                 // You can add any additional configuration here
                 release: 'TAG_VERSION',
-                environment: isProd ? 'production' : 'development'
+                environment: isProd ? 'production' : 'development',
+                ignoreErrors: [
+                    'ResizeObserver loop completed with undelivered notifications' // https://bugzilla.mozilla.org/show_bug.cgi?id=1685038
+                ]
             });
         });
     </script>