1. Open the Firefox menu by clicking the icon in the upper right area of the browser:
2. Next, Click Options
3.Click Applications to the left, then scroll through the list until you find Portable Document Format (PDF). Click this option, and then select “Use Adobe Acrobat Reader” from the drop down list as shown below.
4.Close the settings tab. Please note, when you open a report now, it will still present you with the following prompt, even if you select “Always do this from now on” when a PDF is opened