This proof of concept script was created in response to this forum thread: https://greasyfork.org/forum/discussion/1440/specific-text-on-search-page-play-audio-alert
TO USE: After installation, use the drop-down next to the monkey icon > User Script Commands > Play Tone
The script uses this sound file: http://soundbible.com/1815-A-Tone.html
(Want a funny sound? Try: http://soundbible.com/353-Goat.html
Please do not use the file hosted on my server for any commercial or high volume application (since I might remove it to avoid bandwidth issues).