Firefox 技術支援討論區

Hello Community.

I've selected an option to open PDF's in Firefox for preview. And if I wanted to download the PDF after preview, I simply clicked the downloab button from the preview app/tab. The files were downloaded with default filename and to the downloads folder without prompts. But since a while ago the dialog where the save location must be selected and filename given for the file opens up after the click of the download button.

How can I change it back to the previous behaviour without having to input filename and select the file download directory?