A workaround is to disable the embedded jQuery and use an older version (for example, 1.11.1 which is the previous version the suite used): https://docs.telerik.com/devtools/aspnet-ajax/controls/scriptmanager/disabling-the-embedded-jquery

Repro steps:

1. put a listbox on the page
2. configure it so it does postbacks (e.g., on selection changed, or any other feature)
3. ivnoke said postback (e.g., select an item)

Expected: the action is carried off

Actual: Firefox throws TypeError: access to strict mode caller function is censored

Sample markup

        <telerik:RadListBox runat="server" ID="rlb1" OnSelectedIndexChanged="rlb1_SelectedIndexChanged" AutoPostBack="true">
            <Items>
                <telerik:RadListBoxItem Text="first" Selected="true" />
                <telerik:RadListBoxItem Text="second" />
            </Items>
        </telerik:RadListBox>

When there are few checkbox items in RadListBox (i.e. there is no scroll bar), checked items cannot be unchecked. The issue is reproducible in iPAD.

I have a few instances where I need OnClientSelectedIndexChanging inorder to stop the listbox selectedIndexChanged event from posting back in certain cases. In those cases I stop it from posting back by setting the e.set_cancel(true);

function CheckForListBoxReorder_OnClientEvent(sender, e) {
    if (ListboxReordered()) {
        alert('Please save changes to the bus order.');
        e.set_cancel(true);
    }
}

This works very nicely, but I'm getting many errors because although it looks like it's still selected to the proper row in the listbox the selectedIndex is now -1.

Issue 1 - Items in ListBox missing and/or cut off.
Issue 2 - Incorrect highlighting
Issue 3 - Moving items sometimes doesn't work
Issue 4 - Scrolling of items scrolls the whole page instead (sometimes)
Issue 5 - Bottom ListBox cut off (Chrome dev tools, iPhone 5/SE)
Issue 6 - Scrolling in ListBox sometimes selects items
Issue 7 - Sometimes items in the Listboxes cannot be selected at all. (Intermittent)

The error is observed when an item that is added from the client-side is to be transferred to other RadListBox from a RadListBox that is loading on demand. Unfortunately the control supports such scenario only when that transfer is made from the server side.