Scroll bar in Firefox is very thin and does not widen when hovered

[Amr Ibrahim]

In Ambiance, the scroll bar in Firefox is very thin and does not widen when hovered or pressed. In Adwaita, the scroll bar is thicker and easier to see and pressed.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: light-themes 16.10+18.04.20180328-0ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
Uname: Linux 4.15.0-13-generic x86_64
ApportVersion: 2.20.9-0ubuntu4
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Mon Apr 9 22:56:52 2018
InstallationDate: Installed on 2017-10-02 (189 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Beta amd64 (20170930)
PackageArchitecture: all
SourcePackage: ubuntu-themes
UpgradeStatus: Upgraded to bionic on 2018-03-27 (13 days ago)

[Daniel van Vugt (vanvugt)]

It appears this is a Firefox bug, where Firefox doesn't support auto-widening scroll bars.

[Amr Ibrahim (amribrahim1987)]

I have to disagree a bit about the the duplicates here. This very old bug was when Firefox was using GTK2, and back then the scroll bars in Firefox were GTK2-standard and didn't use the overlay scrollbars (up and down buttons).

All the newer bugs have GTK3 Firefox, and that the scroll bar in Firefox is thin and does not expand, or is not thick by default as in Adwaita. In Adwaita, the scroll bar is already thick and easily handled.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Daniel van Vugt (vanvugt)]

No problem. In that case we should ideally use the oldest relevant duplicate: bug 1575896

The only case in which you shouldn't choose the oldest one is if a newer one contains significantly more useful information.

[Amr Ibrahim (amribrahim1987)]

After more investigation, it turns out that there are two different bugs.

One in FF 46 (bug #1575896) 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.