The actual solution (back to old behaviour, and the best IMHO) is to set browser.download.open_pdf_attachments_inline to true in about:config, as you answered lower down in another message.Thanks again @jscher2000 for the solution
I never understood this policy of removing settings. Once familiar with the default behaviour (which should work out of the box of course), all users have their own specific needs, and should be encouraged to make the software behave as they want it,...
Oh my god, I've been unconsciously extremely annoyed by this new behaviour of systematically downloading pdfs over the past year or so, and finally took the time to search about the issue and solve it! Thanks a lot(note: I had to select "always open ...
