Hi

This support article should help;

https://support.mozilla.org/en-US/kb/where-find-and-manage-downloaded-files-firefox#w_change-where-downloads-are-saved

Hi Paul,

Unfortunately no that article didn’t provide the solution as the file type is not being added to the list of known file types

The "Do this automatically for files like this from now on" checkbox is missing because the site in your screenshot has a response header with a generic content type ("application/octet-stream"). You can override this with Content-Type Fixer.

You can't add entries directly to the download application actions panel, this can only be done via the checkbox on the "Save as" download prompt.

• https://support.mozilla.org/en-US/kb/change-firefox-behavior-when-open-file
• https://support.mozilla.org/en-US/kb/manage-downloads-preferences-using-downloads-menu

If you do not see this panel then this might be a problem with the dark theme you use and you may have to get an update in case you use CSS code in userContent.css.

Start Firefox in Troubleshoot Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration or if userChrome.css/userContent.css is causing the problem.

• switch to the Default System theme: "3-bar" menu button or Tools -> Add-ons -> Themes
• do NOT click the "Refresh Firefox" button on the Troubleshoot Mode start window

• https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

Thanks, I was able to solve this with the https://addons.mozilla.org/en-US/firefox/addon/content-type-fixer/ extension