As add-ons are programs downloaded from the internet, they are potentially malicious. You should only download add-ons you trust.
This add-on previously supported Anki 2.0. You can download the last version supporting 2.0 here. As Anki 2.0 has been discontinued, no support is available for this version.
All Anki 2.1.x Add-Ons
I like that you embedded the configuration into the deck options.