Reader View helps, but doesn't completely fix the problem. To get full contrast text you need some custom userContent.css:

  @namespace url(http://www.w3.org/1999/xhtml);
  @-moz-document url-prefix("about:reader") {
    body {
      background-color: #FFFFFF !important;
      color: #000000 !important;
    }
  }

...aaand here's how to justify the text in reader-view for that final bit of perfection.

https://twitter.com/cvs26/status/1206607533617471489

Does it? I can't see most of the comments on this page when I turn on reader mode. (Not that I'm implying the CSS here is deficient; it's better than most.)

I keep forgetting about this. Thanks for reminding me.

Or learn to love proper styling