Hi, I ran into the same problem today, this window on the side that appears after every boot is very annoying.

https://www.mozilla.org/en-US/firefox/98.0/releasenotes/ Firefox has a new optimized download flow . . . . https://support.mozilla.org/en-US/kb/manage-downloads-preferences-using-downloads-menu Changes to how file downloads are handled in Firefox version 98 *Firefox no longer asks what to do for each file by default *Downloads panel automatically opens *Downloaded files are saved to disk *Set a default app to open a file type *"Always Open Similar Files" option from the Downloads panel *Frequently asked questions You can set this pref to false on the '''about:config''' page to prevent opening the download panel on each download. * browser.download.alwaysOpenPanel = false You can open the '''about:config''' page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue. * https://support.mozilla.org/en-US/kb/about-config-editor-firefox