I'm using Mac OS and the system dialog works better for me than the one provided by Firefox. And if a preview is necessary, it is possible to activate "Preview" from the system dialog box (Additionally offers the possibility of generating a pdf). On this forum the subject is very present; there are a large number of "about:config" keys whose modification is supposed to provide a solution; it's a big mess. Some changes that worked with Firefox 101 no longer work after updating to Firefox 102. Eventually I found an answer here: https://support.mozilla.org/en-US/questions/1363191 This question is important. Can you suggest a stable and accessible solution for future Firefox updates? An option in the "Preferences" menu?