.pdf saved as attachment. "Open" or "Save" options. Will only save

.pdf saved as attachment. "Open" or "Save" options. Will only save

In the CRM, when I have an attachment saved to a lead or client, when I click on the .pdf the CRM gives me 2 options. I can either "Open" it or "Save" it.

In the past, when I clicked "Open" it would open in a new tab (browser is Chrome). Now, when I click "Open" it brings up a "Save As" dialog box. It won't simply open in a new tab.

I tried disabling pop up blocks. That did not work. Any suggestions?