By default, Firefox will use an internal display routine to view a PDF file that you download from a web site. However, that may not be what you want to do.
Some people prefer to use Adobe Reader to view/read their PDF files, whether the PDF is being read from their hard drive or is being downloaded/displayed from a web site.
Other people prefer an alternative like Foxit Reader to display their PDF files. I normally choose Foxit Reader, although I experiment with Adobe Reader occasionally.
When you install the reader program (either of them), it will set up as the default PDF display program for a PDF in your web browser. Sometimes you get a yes/no choice. Other times, it just happens.
But, what if you want to change the answer later?
This is not something that is set in the Windows Default Applications in Windows 10, Windows 7, or other versions. This is a program-specific selection — you can use one in Firefox, a different one in Chrome, and another one in Internet Explorer, or Edge, or Opera, etc.
In the example below, I’m going to assume you have Adobe Reader installed already. Similarly, if you want to change to Foxit Reader, the steps are same, assuming you already have Foxit Reader installed but are using a different PDF reader program in Firefox.
First, Close any other Firefox tabs – only the Options tab should be open. This is to make sure that no other page has a pdf open or was trying to open one.
In Firefox, you can set your selected program via the Tools menu bar item. If you don’t have the menu bar displayed, press and release the Alt key to display it.
Select Tools, then Options.
On the Options menu that opens, click on Applications on the left side.
Then, in the search bar, type
Now you want to change the "Action" for "Portable Document Format (PDF)" to "Use Adobe Reader DC" – there are several steps:
- click on Portable Document Format (PDF), click on the option in the Action column. This will make that “option box” display as an option box.
- Click the pull-down in the option box.
- Select Use “Use Adobe Acrobat (in Firefox)” (or “Use Foxit Reader”).
- Close Firefox.
- Open Firefox and continue your work.