A workaround is to adjust the minimum width of the non-hovered scrollbar
in the theme, eg for Ambiance, by changing
/usr/share/themes/Ambiance/gtk-3.20/gtk-widgets.css so that the
scrollbar min-width is 10px wide instead of 5px wide (you then need to
restart Firefox or change the theme, eg with unity-tweak-tool):

  .scrollbar.vertical slider,
  scrollbar.vertical slider {
      min-height: 15px;
      min-width: 10px;
  }

Then the scrollbars are usable again in Firefox.

(I did try putting this in a config file ~/.config/gtk-3.20/gtk-
widgets.css, but it didn't make any difference, perhaps because of
https://askubuntu.com/questions/892097/why-are-gtk-3-0-custom-settings-
ignored.)

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https://bugs.launchpad.net/bugs/1683997

Title:
  Firefox scrollbars are too narrow and difficult to use in Zesty

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