This will not affect media embedded in a web page - only links to the files themselves. # Click the menu button [[Image:New Fx Menu]] and choose '''Preferences'''. # Select the {menu Applications} panel. # The Applications panel will display. Select the type of file for which you want to change the default action. '''Multiple entries for the same [http://en.wikipedia.org/wiki/File_format file format or extension]?''' Some file types can include more than one Internet Media type. # The Action column will give you a drop-down menu, with options on action to take, whenever you click that type of file. #;[[Image: ApplicationsDropPDFWin]] #*'''Always ask''': will prompt you to select what action you want Firefox to take when you click on that type of file. This can be useful if Firefox is automatically saving a file type or is always opening it with a certain program and you want to be asked what to do. #*'''Save File''': will always save the file to your computer using the [[Find and manage downloaded files|Downloads window]], whenever you click that type of file. #* Open the file with an application or plugin of your choosing. # Click '''Close''' to close the Preferences window. -------- See also: https://support.mozilla.org/en-US/kb/change-firefox-behavior-when-open-file

Thank you for your advise, but, unfortunately, I use Puppy Linux. There is no "use Adobe in Firefox" entry. I set Action as "preview in Firefox" and want to leave it so. I would like to use Acrobat Reader (as default) to open a downloaded PDF file in the "Downloads" window. Thank you