Hey there. From what I can find, it doesn't look doable through Javascript; the most useful discussion I found is from way back on Stack Overflow http://stackoverflow.com/questions/230205/how-can-print-preview-be-called-from-javascript.

The only way I can find to invoke or call the print preview in Firefox is through add-ons with "PrintUtils.printPreview(PrintPreviewListener);", source: https://support.mozilla.org/en-US/questions/948326.

Why do you want to show Print Preview instead of calling the Print dialog?

jscher2000 said

Why do you want to show Print Preview instead of calling the Print dialog?

thanks for your recall, It's just requirement of app customers. They like Chrome, but works in Mozilla. Nevertheless, they want to invoke preview by clicking button on html-page