Today i updated my firefox to the latest version and one big feature is the reader view for desktop. We launched a webshop two weeks ago and now there is this tiny \"reader view
There is no way of forcing disabling the Reader View to the user, But if it is important to your site, you can notify the user to disable or not use the reader feature of firefox.
This would be the way to Disable the Reader on the users browser
about:config
in browser address barreader.parse-on-load.enabled
false
(right click > toggle to false )