Install Tampermonkey
To install Tampermonkey, go here:
https://tampermonkey.net/
Then click on Tampermonkey Safari

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Install A4A801
To install A4A801, go here:
http://outil.derpolino.shost.ca/addon/A4A801.user.js
A window will open, click on Install

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A4A801 is now installed!