This is an amazing extension. I took the opportunity to render the end results in various browsers. These pages always displayed.

Minimal browsers like Dillo were no issue. Command line browsers like lynx, elinks, links displayed the pages well. Then I went extreme and ran SingleFile saved pages on a number of DOS browsers from the 90s (still a huge DOS fan).

Browsers like Arachne, Bobcat, knots, doslynx... html viewers of the time like hview077, htmlvw and others. The SingleFile saved pages just kept displaying.