It should be possible to paste images from the clipboard with Ctrl+V in places that accept images like Google Image search. Make sure the input area has keyboard focus. Does it work in [[Diagnose Firefox issues using Troubleshoot Mode|Troubleshoot Mode]]?

Note that with Firefox 120 you are behind on updates (122.0 has been released the 23th). *https://support.mozilla.org/en-US/kb/update-firefox-latest-release Boot the computer in Windows Safe Mode with network support to see if that has effect. *[https://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/] *[https://www.digitalcitizen.life/4-ways-boot-safe-mode-windows-10/]