diff --git a/modules/firefox.nix b/modules/firefox.nix
index 52a15f6..365af23 100644
--- a/modules/firefox.nix
+++ b/modules/firefox.nix
@@ -69,6 +69,8 @@
 
           # Don't automatically save PDF files in ~/Downloads/
           "browser.download.start_downloads_in_tmp_dir" = true;
+          # Ask where to save before starting download.
+          "browser.download.useDownloadDir" = false;
         };
 
         search.default = "Startpage";