My pet peeve is that every single time you click any web link in PDFs, you have to confirm via a dialog that you want to visit a link. You used to just be able to click links.
I’ve never seen that, I use Safari. My nit about PDFs is pages that download the PDF rather than view them within the browser.
For me, it's about 30% of my pdfs just showing blank/white pages... when I drag them to a Firefox tab, they render perfectly. It's Preview, not the pdf that's the problem.