This is my favorite PDF reader of all time. I am not 100% sure how FOSS
freindly they are but this has the best feature set of any PDF
viewer/reader I have used to date.

https://www.foxitsoftware.com/products/pdf-reader/

-- 
A mouse trap, placed on top of your alarm clock, will prevent you from
rolling over and going back to sleep after you hit the snooze button.

Stephen