Firefox Bookmark popup menu truncated

When I click the bookmark icon on Firefox the popup menu is shown partially. You can see an example in the screenshot below:

This is very annoying because if I want to put the bookmark on another folder there is not enough space to view the folders well and also because the remove bookmark button is not shown when I want to remove an existing bookmark? Is there a way to fix that? Also is that a Firefox or a Fedora bug?

Running Firefox 77 on Fedora 32:

$ cat /etc/os-release 
VERSION="32 (Workstation Edition)"
PRETTY_NAME="Fedora 32 (Workstation Edition)"
VARIANT="Workstation Edition"
$ uname -a
Linux ienclave 5.6.19-300.fc32.x86_64 #1 SMP Wed Jun 17 16:10:48 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
$ dnf info firefox
Last metadata expiration check: 0:08:10 ago on Sat 20 Jun 2020 09:21:53 AM BST.
Installed Packages
Name         : firefox
Version      : 77.0.1
Release      : 2.fc32
Architecture : x86_64
Size         : 254 M
Source       : firefox-77.0.1-2.fc32.src.rpm
Repository   : @System
From repo    : updates
Summary      : Mozilla Firefox Web browser
URL          :
License      : MPLv1.1 or GPLv2+ or LGPLv2+
Description  : Mozilla Firefox is an open-source web browser, designed for standards
             : compliance, performance and portability.

Are you sure that isn’t an issue with your theme? Which theme are you using?

I am using the default Fedora theme. I haven’t used Gnome before so I have changed nothing from the defaults that Fedora ships with, meaning no changes in fonts, themes or extensions. I may make changes later but I m curious to experience GNOME as it’s intended by the Fedora Team first.

The only change I can think of from what ships by default is following the instructions on this blog post to enable hardware acceleration of Firefox on wayland.

In short, those changes are:
$ sudo dnf install ffmpeg libva libva-utils libva-intel-driver

# Firefox, about:config
# gfx.webrender.enabled  > set to true
# widget.wayland-dmabuf-vaapi.enabled > set to true

I undid them and restarted firefox but the issue persists so I doubt it’s that. Also hardware accelaration looks unrelated to proper window drawing.

My answer got me thinking, what else did I change from the defaults fedora ships with. And one jumped out. From Settings > Displays > Scale I had changed the setting from 100% to 125%. Undoing that change fixed the problem. But now font sizes are too small in my screen.

Aha…fractional scaling is a challenge.

Try changing the font size instead of scaling the interface. I know it isn’t an intuitive solution, but most UI elements will scale with the interface font size so things will get larger as if scaled.

Cool, I 'll give it a try.

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