Opposite for me. Didn’t work in Chrome before, but now when I go back it holds my spot.

Updated version: https://pastebin.com/fkCYUei3

Stylus has a firefox extension here: https://addons.mozilla.org/en-US/firefox/addon/styl-us/

“Top” sorts by comments with the most upvotes. “Hot” are new comments that are receiving upvotes quickly (at least on Reddit).