Confirmed that the issue still happens with v0.65 (which is the latest version via the website
In the “<style> body, html {”, if you add “image-rendering: -moz-crisp-edges;” to that section it renders the loading screen correctly. This was figured out from https://stackoverflow.com/questions/388492/firefox-blurs-an-image-when-scaled-through-external-css-or-inline-style
A fixed file should now be uploaded. While doing some additional testing, the file didn’t work on IE or Edge browsers for me.