[Leparamour]

Same experience here.

It's one the first programs I install on every new system and have recommended it to friends for years.

If any of the programmers involved read here: Thank you very much for all the hard work. It was worth it.

[criddell]

I use the PDF viewer built into Firefox and Edge. Am I missing out on something?

[parsecs]

It's very noticeably slower and computationally intensive compared to Sumatra (or Okular) with larger files like 1000-page long reference manuals as well as massive textbooks, both of which I frequently use. On web browsers, it generally takes a whole few seconds to load if you scroll quickly past a few pages.

I guess if you don't need to jump around in big pdfs, Firefox viewer is perfectly fine.