Fix Firefox PDF Display
If Firefox asks you to save the file every time you browse to a PDF file, try this.
as shown above or pick the
a shown at the right.
A new Firefox tab named Options will open as shown below.
Scroll down to see the Applications section shown below.
As shown above,
Applications list down
Portable Document Format (PDF) and pick it.
If the program isn't there,
select it from the new list, and pick
Then drop down its Action list at the right (which probably says "Save File").
Select the program you want (usually SumatraPDF or Adobe Reader).
Finally, Close the Options tab as shown below.
The change takes effect immediately.