Opening pdfs on firefox in a new tab Using Firefox 86.0 on Big Sur 11.2 and I am trying to find out how to immediately open pdfs in a new tab on firefox when I am given the option to download them. This option was available as the first option on my previous windows computer under &quot;Open with firefox&quot; which automatically opens the pdf in a new tab.

However now all I get is this and even when I navigate to &quot;other..&quot; and select Firefox, a new Firefox window is launched instead of a tab.

Any fixes for this?
Open Firefox preferences (⌘+,) and select appropriat(e) choice(s) under 'Tab'. Functionality you are looking for is 'Open links in tabs instead of new windows' (but others may or may not be helpful as well). If this is selected clicking on link to pdf file will open it in a new tab: