Hi Deepak,
We have checked the reported scenario. We can see a difference printed via chrome and firefox.
Since Document editor converts canvas as image for printing, its quality is not high and varies for different browsers. To print the document editor content with high quality and to provide cross browser support, you can send the document editor content to server-side and convert it to pdf using DocIO and return the pdf document as base64 string to client-side and open it in print preview window.
For your reference, please download the sample from below link which is in ASP.NET MVC.
Here is the DocIO documentation on converting word document to PDF. Kindly check it.
Regards,
Harini C