After more investigation, it turns out that there are two different
One in FF 46 (this exact bug) was about an invisible scroll bar, which
got fixed in a later version. The other newer bug started in FF 52,
which is currently about a very thin scroll bar that regressed in 52 and
later (see the screenshots in bug #1675496).
I have changed the duplicates accordingly.
** Changed in: firefox (Ubuntu)
Status: Confirmed => Fix Released
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Scrollbar thumb not drawn in Firefox 46 and later (gtk3?)
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