You will need to install a user script manager extension to install this script.
List of enhancements:
Those enhancements can be turned on/off by using the configuration dialog (click on your Tampermonkey or Greasemonkey extension, find CDA.pl Enhancer script and click Configuration).
Default action hotkeys can be set to any by passing their codes in the correct input. List of codes of special keys (as "Enter") is available here. In order to disable a chosen hotkey, just leave an entry with a key empty.
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