Select text and press the hotkey to hear the text as morse code. To stop playing just deselect and press the hotkey again.
After installing the script you can change the settings at this page! Default hotkey is ctrl+m.
The script uses the LCWO api to generate the sound. Go to lcwo.net if you want to learn morse code, highly recommended!
The scripts footprint will be kept too absolute minimum so it won't interfere with everyday browsing. No jQuery, just JS.