As you noticed, Firefox 98 changed the standard behavior from "ask what to do" (before) to "save file" (now). After the file is saved, it is added to the Downloads list and by default, the Downloads list drops open for one-click access. If you prefer the file to be sent to an external application automatically, here's what you can try: (1) The content-type for those files might already be on the Applications list on the Settings page. This article has the steps for changing an action there: [[Content types and download actions in Firefox]] (2) If the file type you want to manage is not listed there yet, try this first: open the Downloads list, right-click the file, and choose "Always Open Similar Files". (There is a toolbar button for the downloads list if you don't want to have to open a separate window.) Firefox then should add that file type to the Applications list with a "Use [default application]" action. You can use the steps in the previously mentioned article to change it to an Always Ask action if you prefer to choose each time. (3) If the "Always Open Similar Files" menu item is missing for these downloads, the site might be misidentifying the file as generic binary content instead of identifying it as a specific type. This is harder to work around. I can suggest an add-on if needed.