I have turned off all notification sounds, but I still get some startling alerts.
I only get an occasional tone blast - sometimes they are different. I can't figure out what is causing them or how to disable the sound other than turning off the sound.
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Firefox itself has no sounds. It must be an add-on or separate program. When does this happen?
Separate Issue; Your System Details shows;
Installed Plug-ins
Adobe PDF Plug-In For Firefox and Netscape "9.5.5"
Adobe PDF Plug-In For Firefox and Netscape 15.16.20039
Having more than one version of a program may cause issues.
You must remove the older programs. Then get the current full installer.
Adobe PDF Plug-In For Firefox and Netscape: Adobe Reader Version 2015.016.20039 Note: Other Software is offered in the download.