A recent (since January 2022?) update to Firefox means that anything you save from the internet (e.g. an image) pops up a download box as the item is downloading. If you want to turn off this box, you’ll need to change a configuration setting in Firefox.
- Open a new tab in Firefox.
- Type about:config in the address bar (no spaces).
- Click the Accept the risk… warning bar to proceed.
- Click Show all at the top of the next page. This will open the configuration settings.
- Search for browser.download.alwaysOpenPanel.
- Click the far right icon for this setting to toggle it from True to False.
- Close the tab.
You’ll still get a small icon on the toolbar to indicate when something is downloading/has downloaded, but you won’t get the popup box.