Opera crashes when trying to set itself as the default browser on Fedora 44 KDE (Flatpak)

Parzival-1507

Parzival-1507

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?