Install Violentmonkey: https://violentmonkey.github.io/

FullchanX
https://greasyfork.org/en/scripts/533067-fullchan-x

LynxChan--
https://greasyfork.org/en/scripts/533169-lynxchan-extended-minus-minus

8chan-buffs
https://greasyfork.org/en/scripts/533136-8chan-buffs

Some extra stuff: 
https://rentry.org/fbf8q59r

Notifications + other stuff: 
https://rentry.org/8chanMinusMinus