Found a ? bug
this addon conflicts with scroll to to addon
tested both
https://addons.mozilla.org/en-US/firefox/addon/top-and-bottom-scroll-buttons/
https://addons.mozilla.org/en-US/firefox/addon/scroll-to-top/
this addon caused the top bottom button to follow the page when scrolled up/down
kindly fix if possible. Otherwise its a great addon.

Thank you for porting. Slight problem with Facebook Chat windows though. They bounce to the bottom of the page, and I can't catch up with them no matter how far down I scroll. Facebook also has numerous other problems related to scrolling (for example, chat options on the bottom right corner bounce to the bottom with the chat windows) and Facebook posts tend to bounce up and down too. Would be great if this could be fixed!

EDIT: Oh, and Outlook is completely unusable.

Dark Reader was already my favorite dark theme on Chrome.
Though the firefox version is a little more buggy, It's still superior to the other I've found.

Good but facebook not working. Left menu and chat are not showing correctly