The Snap package of Firefox 59 has wider scrollbars for me on Ubuntu 17.10. Might be worth checking out if you struggle to interact with the narrow scrollbars.
> sudo snap install firefox -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1675496 Title: Scrollbars are tiny in Firefox (since FF 52) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1675496/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
