The fix to the incessant Firefox multiple tab reminder problem can be found in this thread
. Short version: Go to about:config
and make sure the values for "browser.tabs.warnOnClose" and "browser.warnOnQuit" are both set to "false".
I have not observed the behavior from Audacious that you describe.
Are you attributing a fault to LinuxMint for something that is happening in Firefox...?
My guess is that, since I haven't seen this particular behavior in Firefox (or Debian's Iceweasel) in any of the distros I've played with recently (including Kubuntu, Xubuntu, PCLinuxOS, Hanthana Linux, Fedora 18 beta, Vector Linux, Debian, and openSUSE, among others), yes, one could reasonably attribute this behavior to the way Firefox is configured in Linux Mint. Don't take it personally.