The Firefox PDF reader is atrocious. Opening any non-trivial PDF causes it to crash even on an i9 with 32GB of RAM. I guess this is because it's rendering the pdf to HTML.
Huh, I guess “non-trivial PDF” is so wide a spectrum as to become meaningless, but FWIW I’ve never had any such problems on much lower hardware specs. I am, however, only talking about whole books, long-ish forms, brochures with print-quality images and graphs and that sort of thing. Since PDFs can theoretically contain anything under the sun, are you perhaps talking about more exotic use cases (interactivity, animat…
I use Firefox by default, but I open PDFs with large organization charts very regularly. I have Edge open for this because Firefox renders everything in these documents far too slowly.