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While using Firefox, the copy function will scroll the page to the top.
I've attached a GIF reproducing the issue using the demo page here:
https://ej2.syncfusion.com/angular/demos/document-editor/default/
I was able to work around the issue by modifying the copyToClipboard function by adding
{preventScroll: true} to div.focus() in this section:
if (navigator.userAgent.indexOf('Firefox') !== -1) {
div.tabIndex = 0;
div.focus();
}