I have not spent the time to see what configuration changes you need to make to have the other browsers work. I just know those are working without any changes made at the moment. Good luck!

Pasting directly into an HTML formatted form in ServiceNow can be done with IE11 & FireFox 28 without config changes.The following browsers do not provide this option out of the box - Safari 5.1.7 and Chrome 34.0.1847.116 m