widen scrollbars in Ubuntu 18.04 (Gnome) especially in Firefox

UPDATE: Solution to make Firefox’s scrollbars wider as of 2022

go to about:config in the search bar.

Find widget.non-native-theme.scrollbar.size.override and set it to something like 20.

(I rather liked the extra fat scrollbars i got with 30 but as i left them on autohide it would sometimes cover an element that i needed to click when i moved over there.)

I tried the stuff in https://askubuntu.com/a/827213/95056

… no effect yet, will check back in after a restart.