This extension seems to break some websites as it hides all scrollbars within pages. For those who only want to hide the main scrollbar, this extention (https://addons.mozilla.org/en-US/firefox/addon/scrolantana) does exactly this and is hence compatible with all websites. It also makes inner scrollbars thinner, so they take less space than usual if this can help. Haven't found any issues with it so far.

Works really well, except when it doesnt. A lot of sites seem to be broken, ie removing the scrollbar removes the ability to scroll completely.

Unfortunately I havent kept a list of examples, but Asus' https://rog.asus.com/ is a bad offender. Impossible to use without turning this extension off.

does is it not work anymore or is it just me? :(

It does work if you have the scrollbar on the right, I have it on the left. Anyways after trying it with the scrollbar on the right It could get improved if hovering over the zone of the scrollbar activate it because when you need to scroll to a very exact zone on the page, as when you want to see a video and want to focus only on it I found it difficult to do it if it is not clicking directly on the sidebar. Good idea, though.

Kein einloggen bei Google mehr möglich wenn Hide-Scrollbars aktiviert ist !

Will come back and try later - at the moment is breaking sites.

https://play.mob.org/ for example.