What's the problem with the Poppler-based ones? I've been producing (with LaTeX) and consuming (with Poppler/Okular) PDFs for a decade and never once have I had to worry about anything related to the format (including tracking).

Poppler looks great! But, I _just_ learned about it and I don't think that the majority of population, say, outside of HN knows about its existence, so it's good to have a fairly mainstream alternative available.

OK, Firefox is, sadly, far from being a mainstream browser nowadays, but still I suspect it has a larger user base than Poppler.

Which PDF readers contain tracking? Anyway, there are several open-source ones that don't.

Acrobat and Chrome come to mind.

> it's a PDF reader that doesn't come with a tracking package

Uh, what? Firefox supports javascript. PDFs support javascript. Javascript empowers tracking.

Firefox PDF support is actually Javascript.

https://github.com/mozilla/pdf.js

following that logic

- every browser that supports cookies comes with a tracking package

- electron comes with a tracking package

- every language interpreter, runtime or compiler is a tracking package.

- your OS can run tracking software, thus coming with a tracking package.

- Anyone carrying their phone comes with a tracking package

Hang on, did you just post something on the internet? Your HN account comes with a tracking package!