Autohide scrollbars solution for Firefox 57+ WebExtensions obstacles. Tips for tweaks are appreciated :) source: https://www.reddit.com/r/firefox/comments/6v6otw/webex_replacement_for_hidescrollbars/
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Another way
Maybe a way to have custom scrollbars back is to get rid of the previous ones first by using something like that in userChrome.css:
#content browser {
margin-right: -15px !important;
overflow-y: scroll;
overflow-x: hidden;
}
NEXT, use an userscript to draw new custom scrollbars on the page (?)