I have been using SumatraPDF on Windows for a long time. After opening a PDF file with it for the first time, I never went back to Adobe Reader. SumatraPDF is much faster, cleaner and less memory hungry.
It's as simple as it gets (with a UI), it's fast, robust and reliable. I wish governments would set aside some generous budgets for this type of projects that are consistently useful and reliable, like they do for arts and education (well, some governments).
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.
I guess if you don't need to jump around in big pdfs, Firefox viewer is perfectly fine.
but I am adobe hater, didn't use their software for decades, now I am using for years Foxit reader
Indeed, it's a "viewer" not an "editor" :)