Hi Guys we use Firefox when viewing emails on outlook Web Access, when we have a PDF attachment we can click on the PDF and it Previews the PDF perfect however there is a button on the PDF Preview called "Print", when we click this it does not bring any print dialog box for us to select a print option. We have tried every other browser and it works perfect and we have tried every version of FireFox right back to 72.0. I have contact Microsoft support and they told me to get in touch with FireFox as it works correctly with all other browsers, we have also tried installing different PDF viewers (Foxit Reader and Adobe Reader DC) with no difference. I have attached a screen shot for your information.

please help me thanks in advance