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New change - Dialog box for files has "Open in Firefox" option

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I just noticed this change today when opening and/or downloading PDFs. I haven't worked with any PDFs in a couple of weeks so I believe this is a recent change. Now there is a third option in the dialog box that says "Open in Firefox". How do I remove this?

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That new option is for Firefox's builtin PDF viewer. If you don't want that option to appear, it can be removed simply by disabling Firefox's PDF viewer. This is done by setting the pdfjs.disabled preference to true using the about:config page.

Hope this helps.


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Firefox 78+ releases offers a choice to open PDF files that would normally be saved or opened in an external application in Firefox.
See "What's New" in the "3-bar" Firefox menu button drop-down list. You can control this feature via a pref on the about:config page.

  • browser.helperApps.showOpenOptionForPdfJS = false

You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.


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