This is often based on the configuration of your browser.  Most of the times to copy and paste you only need to press Ctrl + C and to paste Ctrl + V.

It is a known issue that Firefox does not allow this to occur for security reasons.  We cannot advise you as what is best to do here, but we do recommend using Microsoft Internet Explorer, Google Chrome or Microsoft Edge.

The ERM system does work with Firefox, but there are limitations on the Copy and Paste function.