Trovato sul sito di askvg (non ho avuto il tempo di provarlo ma scrivono che dovrebbe ripristinare il vecchio modo): 1. Open Firefox and type about:config in the addressbar and press Enter. It’ll show you a warning message, click on “Accept the Risk and Continue” button. It’ll open Firefox’s hidden secret advanced configuration page i.e. about:config page. 2. Now type improvements in Search filter box and look for following preference in the window: browser.download.improvements_to_download_panel The preference value is set to true by default, which means the new automatic download behavior is activated and enabled in Firefox. 3. To deactivate and disable the new behavior and restore classic download prompt feature, double-click on browser.download.improvements_to_download_panel preference and set it to false. Alternatively, you can click on the Toggle icon given next to the preference name.