I recently switched to Fedora 44 KDE Plasma (fresh installation).
After installing all system updates, I installed the Flatpak version of Opera from KDE Discover (version 133.0.5932.60).
Opera launches normally and the first-run setup works fine until I click "Yes, set as default browser". As soon as I click that button, Opera immediately crashes every time.
The browser works normally otherwise; the crash only occurs when Opera tries to register itself as the default browser.
I've reproduced the issue multiple times on a completely fresh installation.
The desktop notification reports:
The command /app/opera/opera (Part of Opera) encountered a fatal error and terminated.
Signal: 5 (TRAP)
Full coredump:
PID: 5666 (opera)
UID: 1000 (parzival_1507)
GID: 1000 (parzival_1507)
Signal: 5 (TRAP)
Timestamp: Tue 2026-08-04 12:43:57 CEST
Command Line: $'/app/opera/opera --disable-features=WebAssemblyTrapHandler,DesktopPWAsRunOnOsLogin'
Executable: /app/opera/opera
Control Group: /user.slice/user-1000.slice/user@1000.service/app.slice/app-flatpak-com.opera.Opera-2282098345.scope
Unit: user@1000.service
User Unit: app-flatpak-com.opera.Opera-2282098345.scope
Slice: user-1000.slice
Owner UID: 1000 (parzival_1507)
Boot ID: [redacted]
Machine ID: [redacted]
Hostname: fedora.home
Storage: /var/lib/systemd/coredump/core.opera.1000.6ab5b4f4a7a54ec69f66123b5349aa80.5666.1785840237000000.zst (present)
Size on Disk: 17.5M
Message: Process 5666 (opera) of user 1000 dumped core.
Stack trace of thread 2:
#0 0x00005615776a362c n/a (/app/opera/opera + 0x822662c)
#1 0x000056157410edc0 n/a (/app/opera/opera + 0x4c91dc0)
#2 0x0000561571bc7dff n/a (/app/opera/opera + 0x274adff)
#3 0x00005615729eb8ae n/a (/app/opera/opera + 0x356e8ae)
#4 0x00007f9ba930e18e n/a (/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.8400.4 + 0x6418e)
#5 0x00007f9ba930f1bf n/a (/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.8400.4 + 0x651bf)
#6 0x00007f9ba930f323 n/a (/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.8400.4 + 0x65323)
#7 0x0000561578e03315 n/a (/app/opera/opera + 0x9986315)
#8 0x0000561573037344 n/a (/app/opera/opera + 0x3bba344)
#9 0x0000561573bfb78f n/a (/app/opera/opera + 0x477e78f)
#10 0x000056157414a736 n/a (/app/opera/opera + 0x4ccd736)
#11 0x000056157646c892 n/a (/app/opera/opera + 0x6fef892)
#12 0x0000561578514ab9 n/a (/app/opera/opera + 0x9097ab9)
#13 0x0000561578514857 n/a (/app/opera/opera + 0x9097857)
#14 0x0000561578511bfd n/a (/app/opera/opera + 0x9094bfd)
#15 0x0000561573ec3858 n/a (/app/opera/opera + 0x4a46858)
#16 0x00007f9ba9941b5f n/a (/app/lib/libzypak-preload-host-spawn-strategy.so + 0x9db5f)
#17 0x00007f9ba84b6975 n/a (/usr/lib/x86_64-linux-gnu/libc.so.6 + 0x2b975)
#18 0x00007f9ba84b6a28 n/a (/usr/lib/x86_64-linux-gnu/libc.so.6 + 0x2ba28)
#19 0x00007f9ba9941df4 n/a (/app/lib/libzypak-preload-host-spawn-strategy.so + 0x9ddf4)
#20 0x000056157439d9ea n/a (/app/opera/opera + 0x4f209ea)
ELF object binary architecture: AMD x86-64
System information
Operating System: Fedora Linux 44
KDE Plasma: 6.7.3
Frameworks: 6.28.0
Qt: 6.11.1
Kernel: 7.1.5-201.fc44.x86_64
Graphics Platform: Wayland
CPU: Intel Core i5-11400F
RAM: 32 GB
GPU: NVIDIA GeForce RTX 3060
Is this a known issue with the Flatpak build on Fedora 44, or is there any additional information I can provide to help diagnose it?
