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How do I make PDF files open in Adobe instead of preview in firefox on a Mac?


Client wants to open PDF files in Acrobat within Firefox instead of in Preview.

When she clicks on a PDF file, the only option to open with is Preview. Client has latest versions of both, and installed Acrobat after Firefox.


  1. Open a PDF in Firefox. At the Open with dialogue, click on the Automatically open with this setting... checkbox.
  2. Close Preview.
  3. From the menu bar of Firefox, click Firefox > Preferences and go to the Applications tab..
  4. In the window that appears, select the pdf extension and click on the action
  5. In the drop down that appears, select Acrobat.
  6. Exit out of the preferences. Now, whenever a PDF is clicked, it will automatically open in Adobe instead of Preview.

See Also


Documentation and information provided by the MIT Community

Last Modified:

August 04, 2020

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