User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:47.0) Gecko/20100101 Firefox/47.0 Build ID: 20160607113630 Steps to reproduce: open https://bugzilla.mozilla.org/buglist.cgi?quicksearch=scrollbar&list_id=13063411 for example. Actual results: there is no scrollbar here (checked in Fedora 23, 24, Ubuntu Gnome) Expected results: It should be visible

Bug 1275407 was intended to fix something specific to GTK 3.20, but Fedora 23 doesn't has 3.18. Similarly Ubuntu have been sensible enough to stay clear of 3.20. What theme was in use on Fedora 23 and Ubuntu? What was the Ubuntu version?

Looks like my bug is not the same as #1275407. There is no scrollbar at all as you can see in attachment. My Fedora version is 24 now and I can not test on F23. Ubuntu is 16.04. Both on standard light Adwaita theme.

(In reply to kreopt from comment #0) > User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:47.0) Gecko/20100101 Are you able to test, please, whether this bug occurs on Ubuntu 16.04 with a Mozilla build? I know some of Fedora's patches are related, but I don't know about Ubuntu.

Unfortunately, I can not test on Ubuntu anymore. But I have one note: it seems scrollbars are ok in ff developer edition.

Thanks. I'm not clear exactly what fixed this, but it seems a similar issue to bug 1272951, which was fixed in bug 1234158.