In addition, I use Infy Scroll, [1] which works with "newest" to give me a daily digest in HTML. I let it scroll, and copy a day's worth. Paste into SeaMonkey (New Composer Page), paste and save as HTML.
Easter Egg is that I have to quickly click in the Search Box to gain focus for searching. It's my only video game.
Appreciate the OP nonetheless.
Dark Reader works on all sites (it's configurable) and it only scrambles a few sites that react poorly to it.
[0] https://addons.mozilla.org/en-US/firefox/addon/darkreader/
[1] https://addons.mozilla.org/en-US/firefox/addon/infy-scroll/
news.ycombinator.com##td:style(color: #f8f8ff !important) news.ycombinator.com##div.toptext:style(color: #f8f8ff) news.ycombinator.com##span.c00:style(color: #f8f8ff !important) news.ycombinator.com##span.pagetop:style(color: #f8f8ff !important) news.ycombinator.com##textarea:style(color: #f8f8ff !important; background: #1a1a1a;) news.ycombinator.com##p:style(color: #f8f8ff !important) news.ycombinator.com##div.commtext:style(color: #f8f8ff !important)
And the xmas stuff still works