diff --git a/server/core.php b/server/core.php
index 1d742ca..309361e 100644
--- a/server/core.php
+++ b/server/core.php
@@ -747,6 +747,19 @@ function init_class($enableDebugger=true, $headers=true)
     }
     bdump(get_included_files());
     bdump($translations->loaded_translations);
+
+    if(isset($_GET["disableSW"])){
+        setcookie("disableServiceWorkerInstallation", true);
+        $tools->redirect("?");
+    } else if(isset($_GET["enableSW"])){
+        setcookie("disableServiceWorkerInstallation", false, time() - 3600);
+        setcookie("forceServiceWorkerInstallation", false, time() - 3600);
+        $tools->redirect("?");
+    } else if(isset($_GET["forceSW"])){
+        setcookie("disableServiceWorkerInstallation", false, time() - 3600);
+        setcookie("forceServiceWorkerInstallation", true);
+        $tools->redirect("?");
+    }
 }
 
 function t($string, $echo=true)
diff --git a/server/resources/src/main.js b/server/resources/src/main.js
index 559d92f..f1cf324 100644
--- a/server/resources/src/main.js
+++ b/server/resources/src/main.js
@@ -14,7 +14,7 @@ import 'jquery-pjax';
 console.log("Commit: "+process.env.GIT_VERSION);
 console.log("Date: "+process.env.GIT_AUTHOR_DATE);
 console.log("Bundle mode: "+process.env.BUNDLE_MODE);
-console.log("Bundle date: "+process.env.BUNDLE_DATE);
+console.log("Bundle date: "+new Date(process.env.BUNDLE_DATE).toISOString());
 
 $(document).pjax('a:not(.pjax_disable)', '#content', {timeout: 100000});
 $(document).on('pjax:start', function() {
@@ -54,14 +54,21 @@ $( document ).ajaxError(function(event, xhr, settings, error) {
     console.log(settings);
 });
 
-var installServiceWorker = true;
 if (getCookie("authenticated")) {
+  var installServiceWorker = true;
+  if(window.skipServiceWorkerInstallation !== undefined){ //if you want to disable SW for ex via greasyfork userscript
+    installServiceWorker = false;
+  }
+  if(getCookie("disableServiceWorkerInstallation")){
+    console.log("Skipping ServiceWorker installation because cookie 'disableServiceWorkerInstallation' exists");
+    installServiceWorker = false;
+  }
   if ('serviceWorker' in navigator) {
-    if ('connection' in navigator && navigator.connection.saveData && !getCookie("forceServiceWorkerInstall")) {
+    if ('connection' in navigator && navigator.connection.saveData && !getCookie("forceServiceWorkerInstallation")) {
       console.log("Skipping ServiceWorker installation because saveData is enabled");
       installServiceWorker = false;
     }
-    if ('storage' in navigator && 'estimate' in navigator.storage && !getCookie("forceServiceWorkerInstall")){
+    if ('storage' in navigator && 'estimate' in navigator.storage && !getCookie("forceServiceWorkerInstallation")){
       navigator.storage.estimate().then(quota => {
         const requiredMemory = 3 * 1e+6;
         if (quota < requiredMemory) {
diff --git a/server/templates/base.html b/server/templates/base.html
index 278091f..806fa58 100644
--- a/server/templates/base.html
+++ b/server/templates/base.html
@@ -8,6 +8,44 @@
   <meta name="google" content="notranslate">
   <meta name="robots" content="none">
   <link rel="manifest" href="manifest.webmanifest">
+  {% if delete_caches %}
+  <script>
+  //from https://stackoverflow.com/a/57149239
+  if ('caches' in window) {
+    console.log("Deleting caches...");
+    caches.keys()
+    .then(function(keyList) {
+      Promise.all(keyList.map(function(key) {
+        caches.delete(key);
+        console.log("deleted cache: "+key);
+      }));
+    });
+  }
+  /*{% if not delete_service_workers %}*/
+  location.href="?";
+  /*{% endif %}*/
+  </script>
+  {% endif %}
+  {% if delete_service_workers %}
+  <script>
+  //from https://stackoverflow.com/a/47515250
+  if(window.navigator && navigator.serviceWorker) {
+    console.log("UnRegistering service workers...");
+    navigator.serviceWorker.getRegistrations()
+    .then(function(registrations) {
+      for(let registration of registrations) {
+        console.log("deleted service worker:");
+        console.log(registration);
+        registration.unregister();
+      }
+    });
+    location.href="?";
+  }
+  /*{% if delete_service_workers_and_disable %}*/
+  document.cookie = "disableServiceWorkerInstallation=1";
+  /*{% endif %}*/
+  </script>
+  {% endif %}
   <script src="{{ urlsoftware }}/resources/dist/{{ resource('main.js') }}"></script>
   {% if enable_technical_support and technical_support_open %}
   <!-- Smartsupp Live Chat script -->
diff --git a/server/ui.php b/server/ui.php
index 1295d1f..6a76846 100644
--- a/server/ui.php
+++ b/server/ui.php
@@ -55,6 +55,9 @@ function loadtemplate($templatename, $data, $requirelogin=true)
     if($requirelogin) {
         $user->requirelogin();
     }
+    $data['delete_caches'] = isset($_GET["deleteCache"]) || isset($_GET["unregisterSW"]) || isset($_GET["unregisterSWandDisable"]);
+    $data['delete_service_workers'] = isset($_GET["unregisterSW"]) || isset($_GET["unregisterSWandDisable"]);
+    $data['delete_service_workers_and_disable'] = isset($_GET["unregisterSWandDisable"]);
     $data['owner'] = $database->getOption("owner");
     $data['urlsoftware'] = $database->getOption("web_url");
     $data['user'] = $user->info();