Are you triggering successive calls to the print method from within the same script? This one runs into problems on the seventh call (the Esc key will come in handy):

<button onclick="window.print(); window.print(); window.print(); window.print(); window.print(); window.print(); window.print();">Print</button>

A bit of scrolling or interaction with another control seems to reset the counter, so that limit seems as though it should be high enough.

No, only one call, but it is actually being called from within a javascript. Here is the code to call the script;

        <div id="printBox">
            <asp:Button ID="printButton" runat="server" Text="Print" onfocus="copyText();" OnClientClick="copyText();" />
        </div>

And here is the script code;

<script type="text/javascript">

    function copyText() {

        srcDateBox = document.getElementById("dateBox");
        srcPayTo = document.getElementById("payToo");
        srcOrigAmt = document.getElementById("checkAmount");
        srcMemo = document.getElementById("memoBox");
        // Get register ID's
        destRegDateBox = document.getElementById("cellDate");
        destRegRef = document.getElementById("cellReference");
        destRegPayTo = document.getElementById("regpayto");
        destRegOrigAmt = document.getElementById("cellOrigAmt");
        destRegBalDue = document.getElementById("cellBalDue");
        destRegPayment = document.getElementById("cellPayment");
        destRegChkAmt = document.getElementById("cellChkAmt");
        // The following fills the register
        destRegDateBox.textContent = srcDateBox.value;
        destRegRef.textContent = srcMemo.value;
        destRegPayTo.value = srcPayTo.value;
        var origAmt = srcOrigAmt.value
        origAmt = origAmt.replace(/\*/g, '');
        destRegOrigAmt.textContent = '' + origAmt;
        destRegBalDue.textContent = '' + origAmt;
        destRegPayment.textContent = '' + origAmt;
        destRegChkAmt.textContent = '' + origAmt;
        // Now lets call the Print
        window.print();
    }

</script>

And I use a CSS to hide certain <div> info;

@media print {

    div#check-1-date-box, div#check-1-pay-to-box, div#check-1-amount-nbr-box, div#check-1-amount-txt-box, div#check-1-memo-box
	{
	 border: solid white !important;
         border-width: 0 1px 1px 0 !important;
         border-bottom-style: none !important;
        }
    div#clearDate, div#printBox, div#helpBox, div#adjDate
    {
        clear:both;
        display:none;
    }        
	 }

I have not tried in Chrome, but I do not get the error in IE 11 or Edge.

You shouldn't get popup/dialog throttling on the first call.

Perhaps some other part of your application is generating a lot of alert(), prompt(), or confirm() dialogs prior to the print() call?

Does it clear up if you reload the page (it should)?

Bugzilla (Mozilla's bug tracking system) is down at the moment, so I can't research the details on this behavior.

In my code I run a couple of AutoPostBack=True calls, but they are used to just to set focus after the textbox contents change, but they are done way before any call to the Print Button. Here are the VB functions that do the PostBack;

Public Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
       Dim varDate As String = DateTime.Now.ToString("d MMM, yyyy")
       dateBox.Text = varDate
       If Page.IsPostBack Then
           Dim wcICausedPostBack As WebControl = CType(GetControlThatCausedPostBack(TryCast(sender, Page)), WebControl)
           Dim indx As Integer = wcICausedPostBack.TabIndex
           Dim ctrl = _
            From control In wcICausedPostBack.Parent.Controls.OfType(Of WebControl)() _
            Where control.TabIndex > indx _
            Select control
           ctrl.DefaultIfEmpty(wcICausedPostBack).First().Focus()
       Else
           payToo.Focus()
       End If
   End Sub

   Protected Function GetControlThatCausedPostBack(ByVal page As Page) As Control
       Dim control As Control = Nothing
       Dim ctrlname As String = page.Request.Params.Get("__EVENTTARGET")
       If ctrlname IsNot Nothing AndAlso ctrlname <> String.Empty Then
           control = page.FindControl(ctrlname)
       Else
           For Each ctl As String In page.Request.Form
               Dim c As Control = page.FindControl(ctl)
               If TypeOf c Is System.Web.UI.WebControls.Button OrElse TypeOf c Is System.Web.UI.WebControls.ImageButton Then
                   control = c
                   Exit For
               End If
           Next ctl
       End If
       Return control

   End Function

And since the PostBacks get routed through the server, they are done serverside so the client should actually not effect the count. Is there not anything in :config that can be set or disabled to prevent this error?

I don't think post-backs are relevant: the limitation is to prevent excessive use to modal dialogs to torment users.

I'm not aware of any user-modifiable preferences for window.print().

By the way, what does .Net turn this into in the actual HTML served to the browser:

<asp:Button ID="printButton" runat="server" Text="Print" onfocus="copyText();" OnClientClick="copyText();" />

<div id="printBox">
            <input type="submit" name="printButton" value="Print" onclick="copyText();" id="printButton" onfocus="copyText();" />
        </div>

But I think I found a cause for the problem, if I take the onfocus call out of the <asp:button> line I do not get the error. So I suspect the onfocus could be calling an event that is trying create the additional dialogs.

I will run the page through the debugger and watch the server-side events, but if the error is client side I don't know if I can watch a client-side events, unless FF for Developers has that feature...

I ran the page through FF Developer v62, and it did not throw the error, so I set a breakpoint on the window.print() with the following results after stepping through it;

<this>: input#printButton​​ accept: ""​​ accessKey: ""​​ accessKeyLabel: "" ​​align: "" ​​alt: "" ​​attributes: NamedNodeMap(6) ​​autocomplete: "" ​​autofocus: false ​​baseURI: "http://localhost/checkprint.aspx" ​​checked: false ​​childElementCount: 0 ​​childNodes: NodeList [] ​​children: HTMLCollection ​​classList: DOMTokenList [] ​​className: "" ​​clientHeight: 16 ​​clientLeft: 3 ​​clientTop: 3 ​​clientWidth: 42 ​​contentEditable: "inherit" ​​contextMenu: null ​​dataset: DOMStringMap(0) ​​defaultChecked: false ​​defaultValue: "Print" ​​dir: "" ​​disabled: false ​​draggable: false ​​files: null ​​firstChild: null ​​firstElementChild: null ​​form: form#Form1 ​​formAction: "http://localhost/checkprint.aspx" ​​formEnctype: "" ​​formMethod: "" ​​formNoValidate: false ​​formTarget: "" ​​height: 0 ​​hidden: false ​​id: "printButton" ​​indeterminate: false ​​innerHTML: "" ​​innerText: "" ​​isConnected: true ​​isContentEditable: false ​​labels: NodeList [] ​​lang: "" ​​lastChild: null ​​lastElementChild: null ​​list: null ​​localName: "input" ​​max: "" ​​maxLength: -1 ​​min: "" ​​minLength: -1 ​​multiple: false ​​name: "printButton" ​​namespaceURI: "http://www.w3.org/1999/xhtml" ​​nextElementSibling: null ​​nextSibling: #text ​​nodeName: "INPUT" ​​nodeType: 1 ​​nodeValue: null ​​offsetHeight: 22 ​​offsetLeft: 0 ​​offsetParent: div#printBox ​​offsetTop: 0 ​​offsetWidth: 48 ​​onabort: null ​​onanimationcancel: null ​​onanimationend: null ​​onanimationiteration: null ​​onanimationstart: null ​​onauxclick: null ​​onblur: null ​​oncanplay: null ​​oncanplaythrough: null ​​onchange: null ​​onclick() ​​onclose: null ​​oncontextmenu: null ​​oncopy: null ​​oncut: null ​​ondblclick: null ​​ondrag: null ​​ondragend: null ​​ondragenter: null ​​ondragexit: null ​​ondragleave: null ​​ondragover: null ​​ondragstart: null ​​ondrop: null ​​ondurationchange: null ​​onemptied: null ​​onended: null ​​onerror: null ​​onfocus() ​​ongotpointercapture: null ​​oninput: null ​​oninvalid: null ​​onkeydown: null ​​onkeypress: null ​​onkeyup: null ​​onload: null ​​onloadeddata: null ​​onloadedmetadata: null ​​onloadend: null ​​onloadstart: null ​​onlostpointercapture: null ​​onmousedown: null ​​onmouseenter: null ​​onmouseleave: null ​​onmousemove: null ​​onmouseout: null ​​onmouseover: null ​​onmouseup: null ​​onmozfullscreenchange: null ​​onmozfullscreenerror: null ​​onpaste: null ​​onpause: null ​​onplay: null ​​onplaying: null ​​onpointercancel: null ​​onpointerdown: null ​​onpointerenter: null ​​onpointerleave: null ​​onpointermove: null ​​onpointerout: null ​​onpointerover: null ​​onpointerup: null ​​onprogress: null ​​onratechange: null ​​onreset: null ​​onresize: null ​​onscroll: null ​​onseeked: null ​​onseeking: null ​​onselect: null ​​onselectstart: null ​​onshow: null ​​onstalled: null ​​onsubmit: null ​​onsuspend: null ​​ontimeupdate: null ​​ontoggle: null ​​ontransitioncancel: null ​​ontransitionend: null ​​ontransitionrun: null ​​ontransitionstart: null ​​onvolumechange: null ​​onwaiting: null ​​onwebkitanimationend: null ​​onwebkitanimationiteration: null ​​onwebkitanimationstart: null ​​onwebkittransitionend: null ​​onwheel: null ​​outerHTML: "<input name=\"printButton\" value=\"Print\" onclick=\"copyText();\" id=\"printButton\" onfocus=\"copyText();\" type=\"submit\">" ​​ownerDocument: HTMLDocument http://localhost/checkprint.aspx ​​parentElement: div#printBox ​​parentNode: div#printBox ​​pattern: "" ​​placeholder: "" ​​prefix: null ​​previousElementSibling: null ​​previousSibling: #text ​​readOnly: false ​​required: false ​​scrollHeight: 16 ​​scrollLeft: 0 ​​scrollLeftMax: 0 ​​scrollTop: 0 ​​scrollTopMax: 0 ​​scrollWidth: 42 ​​selectionDirection: null ​​selectionEnd: null ​​selectionStart: null ​​size: 20 ​​spellcheck: false ​​src: "" ​​step: "" ​​style: CSS2Properties(0) ​​tabIndex: 0 ​​tagName: "INPUT" ​​textContent: "" ​​textLength: 5 ​​title: "" ​​type: "submit" ​​useMap: "" ​​validationMessage: "" ​​validity: ValidityState ​​value: "Print" ​​valueAsDate: null ​​valueAsNumber: NaN ​​webkitEntries: [] ​​webkitdirectory: false ​​width: 0 ​​willValidate: true ​​<prototype>: HTMLInputElementPrototype ​arguments: Arguments ​​0: click ​​callee:onclick() ​​length: 1 ​​Symbol(Symbol.iterator):values() ​​<prototype>: {…} ​event: click ​​altKey: false ​​bubbles: true ​​button: 0 ​​buttons: 0 ​​cancelBubble: false ​​cancelable: true ​​clientX: 627 ​​clientY: 244 ​​composed: true ​​ctrlKey: false ​​currentTarget: input#printButton ​​defaultPrevented: false ​​detail: 1 ​​eventPhase: 2 ​​explicitOriginalTarget: input#printButton ​​isTrusted: true ​​layerX: 27 ​​layerY: 7 ​​metaKey: false ​​movementX: 0 ​​movementY: 0 ​​mozInputSource: 1 ​​mozPressure: 0 ​​offsetX: 24 ​​offsetY: 4 ​​originalTarget: input#printButton ​​pageX: 627 ​​pageY: 244 ​​rangeOffset: 3 ​​rangeParent: null ​​region: "" ​​relatedTarget: null ​​screenX: 627 ​​screenY: 318 ​​shiftKey: false ​​srcElement: input#printButton ​​target: input#printButton ​​timeStamp: 38814 ​​type: "click" ​​view: Window ​​which: 1 ​​x: 627 ​​y: 244 ​​<prototype>: MouseEventPrototype ​​​MOZ_SOURCE_CURSOR: 4 ​​​MOZ_SOURCE_ERASER: 3 ​​​MOZ_SOURCE_KEYBOARD: 6 ​​​MOZ_SOURCE_MOUSE: 1 ​​​MOZ_SOURCE_PEN: 2 ​​​MOZ_SOURCE_TOUCH: 5 ​​​MOZ_SOURCE_UNKNOWN: 0 ​​​altKey: Getter ​​​button: Getter ​​​buttons: Getter ​​​clientX: Getter ​​​clientY: Getter ​​​constructor() ​​​ctrlKey: Getter ​​​getModifierState() ​​​initMouseEvent() ​​​initNSMouseEvent() ​​​metaKey: Getter ​​​movementX: Getter ​​​movementY: Getter ​​​mozInputSource: Getter ​​​mozPressure: Getter ​​​offsetX: Getter ​​​offsetY: Getter ​​​region: Getter ​​​relatedTarget: Getter ​​​screenX: Getter ​​​screenY: Getter ​​​shiftKey: Getter ​​​x: Getter ​​​y: Getter ​​​<prototype>: UIEventPrototype

However the Console did catch an issue with a few lines of js code, once I fixed them my page ran clean with no errors or stops.

mgfranz said

I think I found a cause for the problem, if I take the onfocus call out of the <asp:button> line I do not get the error. So I suspect the onfocus could be calling an event that is trying create the additional dialogs.

I had a suspicion about that: onfocus is not one of the events that bypasses the popup blocker.