When I open any website and wants to see one pdf-file then firefox download that one and do not show this in a new tab. How can I change this?
Hi Mario, do the steps in the following article help:
Firefox 78+ releases offer a choice to open PDF files that would normally be saved or opened in an external application in a Firefox tab (Open in Firefox).
This feature is controlled by prefs on the about:config page that are enabled (true) by default.
You can open the about:config page via the location/address bar. You can click the button to "Accept the Risk and Continue".