Error installing on 3.28.2 (Bionic)

[rileyinman]

Hi! I tried installing this extension but was met by the following error:

TypeError: ExtensionUtils.getSettings is not a function

I see that the only offered download is for a newer version, so I understand if this isn't a concern, but I wanted to see if it was possible to fix given that the extension this is based on installs fine on this version.

(Also, sorry, hit Ctrl+Enter instead of Shift+Enter and submitted this too early by mistake.)