Rufus apparently is something from Amazon. Are you seeing it only when using the Amazon site, or has it infected other sites, too? I don't know whether there is a setting on Amazon to disable it. I did find a discussion on Reddit for users of the uBlock Origin extension on how to add a filter to hide it: * https://www.reddit.com/r/amazonprime/comments/1ezd7u4/rufus_how_to_disable/ * https://addons.mozilla.org/firefox/addon/ublock-origin/