Mozilla plans to add a new security feature to Firefox 82 which will prevent files from being downloaded automatically under certain conditions.
The feature will block downloads starting from sandboxed iframes, a technology used by websites and services to display content such as ads or multimedia on third-party websites.
Sandboxed iframes are not usually used to start downloads, but most browsers do not block these downloads.
Depending on the setting, downloads may be automatically saved in the system download folder, but the Firefox can be configured to display "save to" each time a download is started in the browser. This prompt provides an extra level of protection against unwanted downloads, as you can press the cancel button to stop the download before it reaches the system.
How do you set it up? Open the internal address about: preferences # general in its address bar Firefox, and look down at the download section. The setting must be set to "Always ask you where to save files". This setting may not be convenient for you, as a message will appear every time you download a file, but it offers more security.