switch to local webstorage, https://github.com/opnsense/core/issues/840 thanks @fabianfrz

src/opnsense/www/js/opnsense.js

@@ -218,31 +218,6 @@ function ajaxGet(url,sendData,callback) {
     });
 }
 
-/**
- * set cookie value by key
- * @param key cookie key
- * @param value cookie value
- * @param expire time to live
- */
-function setCookie(key, value, expire) {
-   var expires = new Date();
-   if (expire == undefined) {
-      expire = 3600000 ; // expire in 1 hour
-   }
-   expires.setTime(expires.getTime() + expire); // 1 hour
-   document.cookie = key + '=' + value + ';expires=' + expires.toUTCString();
-}
-
-/**
- * get cookie value
- * @param key cookie key
- * @return cookie value (or null if not found)
- */
-function getCookie(key) {
-   var keyValue = document.cookie.match('(^|;) ?' + key + '=([^;]*)(;|$)');
-   return keyValue ? keyValue[2] : null;
-}
-
 /**
  * watch scroll position and set to last known on page load
  */
@@ -254,12 +229,12 @@ function watchScrollPosition() {
 
     // link on scroll event handler
     $(window).scroll(function(){
-        setCookie('scrollpos',current_location()+"|"+$(window).scrollTop());
+        localStorage.setItem('scrollpos', current_location()+"|"+$(window).scrollTop());
     });
 
     // move to last known position on page load
     $( document ).ready(function() {
-        var scrollpos = getCookie('scrollpos');
+        var scrollpos = localStorage.getItem('scrollpos');
         if (scrollpos != null) {
             if (scrollpos.split('|')[0] == current_location()) {
                 $(window).scrollTop(scrollpos.split('|')[1]);