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Firefox version 132.0.1 Thunderbird version 128.4.0esr O/S: PCLinuxOS Debian Edition (Debian 12 Bookworm) with KDE 5

I am getting a "Click" sound effect when I click Menu Bar items in both Firefox and Thunderbird, Bookmarks in Firefox, Folders in Thunderbird and some other items in both. I can not find a way to turn it off. It does not happen in any other applications, including other web browsers that are forked from Firefox, so I think it is a Mozilla problem.

This is a relatively new installation that was set up copying settings from Firefox on Windows 10 using Firefox Sync. I did not copy anything from Windows Thunderbird because my email is IMAP which brings in everything from the server. I am not getting this clicking sound in Windows Firefox and Thunderbird.

I am GUESSING that the sound effect is due to an Accessibility setting that is buried somewhere, maybe in one of the text-based "about...." configuration files, but I don't know where to look. I have gone through the Linux KDE System Settings and the Settings in Firefox and Thunderbird several times trying to find it. I will note that I set up Firefox and Thunderbird in the same Linux distro on a laptop also using Firefox Sync and do not have this problem with the laptop. Can anyone tell me where to look to get rid of this irritating noise?

Thank You!