Thank you for this extension/fix. I was able to install it quite easily: Download the repo as zip, put it in a new folder "custom-extensions" inside flarums root and do these commands:
composer config repositories.0 path "custom-extensions/*"
composer require the-turk/flarum-scrubber-fix:dev-master
While it works perfect for the footer, I have a new issue with the header when resizing the window which I've reported on Git.