Thunderbird crashes after recent upgrades

Ask Fedora
1

I get the following error when I try to start Thunderbird after installing the latest upgrades:

$ flatpak run net.thunderbird.Thunderbird
[2] Sandbox: CanCreateUserNamespace() clone() failure: EPERM
[Parent 2, Main Thread] WARNING: Could not load a pixbuf from icon theme.
This may indicate that pixbuf loaders or the mime database could not be found.: ‘glib warning’, file /builddir/build/BUILD/thunderbird-140.3.0-build/thunderbird-140.3.0/toolkit/xre/nsSigHandlers.cpp:201

(net.thunderbird.Thunderbird:2): Gtk-WARNING **: 16:13:04.012: Could not load a pixbuf from icon theme.
This may indicate that pixbuf loaders or the mime database could not be found.
**
Gtk:ERROR:../gtk/gtkiconhelper.c:495:ensure_surface_for_gicon: assertion failed (error == NULL): Failed to load /usr/share/icons/Adwaita/scalable/status/image-missing.svg: Failed to create file “~/.var/app/net.thunderbird.Thunderbird/cache/tmp/gdk-pixbuf-glycin-tmp.UU5ME3”: No such file or directory (g-file-error-quark, 4)
Bail out! Gtk:ERROR:../gtk/gtkiconhelper.c:495:ensure_surface_for_gicon: assertion failed (error == NULL): Failed to load /usr/share/icons/Adwaita/scalable/status/image-missing.svg: Failed to create file “~/.var/app/net.thunderbird.Thunderbird/cache/tmp/gdk-pixbuf-glycin-tmp.UU5ME3”: No such file or directory (g-file-error-quark, 4)
Redirecting call to abort() to mozalloc_abort

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2

This is the fourth thread about this,
Downgrade or rollback,
Try updating again in a week or two.

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3

I’ve got the same issue.

There is no history for me on the fedora net.thunderbird.Thunderbird flatpak app:

$ LANG=C flatpak remote-info fedora --log net.thunderbird.Thunderbird

Thunderbird - Thunderbird is a free and open source email, newsfeed, chat, and
calendaring client

        ID: net.thunderbird.Thunderbird
       Ref: app/net.thunderbird.Thunderbird/x86_64/stable
      Arch: x86_64
    Branch: stable
   License: MPL-2.0
Collection: 
  Download: 155.6?MB
 Installed: 340.8?MB
   Runtime: org.fedoraproject.Platform/x86_64/f43
       Sdk: org.fedoraproject.Sdk/x86_64/f43

    Commit: 936d9f60ac420057270d5c0c26b3383b04177b678afd6f6e7b7b59df3f0e6663
   Subject: Export net.thunderbird.Thunderbird
      Date: 2025-10-12 19:21:33 +0000
   History:

I converted back to the flathub thunderbird.

flatpak install flathub org.mozilla.Thunderbird.

after a first start i’ve moved the settings:

mv ~/.var/app/net.thunderbird.Thunderbird/.thunderbird ~/.var/app/org.mozilla.Thunderbird/
4

Thanks Thomas for your reply. I have got it working again now. I think my configuration was lost but I have recreated these settings and it is working again now. All good.

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5

I’ve been having the same problem for a few days now. As a workaround, I start Thunderbird like this:

flatpak run --env=MOZ_ENABLE_WAYLAND=0 net.thunderbird.Thunderbird
6

I just saw an update for Thunderbird, maybe this is the fix?

7

I also received an update for my Fedora Linux Flatpak - Thunderbird starts again as usual :slightly_smiling_face:

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