The default install lets various X applications beep. There have been lengthy
discussions on debianforum.de on how to disable the beep. Suggestions included
blacklisting modules, putting commands in different places in /etc, cutting
speaker cables. Obviously, the beep annoys a lot of users and it's not easy to
find a solution. The solution I finally arrived at was to uncomment the line

set bell-style none

in /etc/inputrc. If this is the proper way to disable beeping, I suggest to
make it default as it will avoid postings like "how to disable beep in Emacs?",
"how to disable beep in Konsole?", "how to disable beep in Firefox?" in the
future and save work for a lot of people. I am aware that some people like the
beep, but I feel the majority doesn't.

I'd like to second this bug. I'm getting this in Debian Jessie - beeps
from firefox when doing find, in tomboy notes, etc. - a quite out of the
blue disruption which reminds many people of computers in 1995! Also, I
suspect that the people who do want this beep are users who are techie
enough to no mind having to find a hack to turn it on.

I agree that this should be disabled by default - failing that, there
needs to be an easy way to disable this from the GUI. (Actually, I just
checked in system settings in KDE and there is a system bell option
under applications and system notifications - although it said that this
was disabled, I've still been getting the beeps.

Cheers!