SUMMARY *** Kmail does not open URL links into the newly installed browser, despite having configured the Default Application to the new browser. *** STEPS TO REPRODUCE 1. Use a working system, 2. Install a new browser, like Brave or LibreWolf 3. Modify the default browser in System Settings accordingly 4. Restart kmail or reboot the computer 5. Open an URL link from within an email using kmail OBSERVED RESULT The originally configured browser opens the link. EXPECTED RESULT The newly configured browser opens the link. SOFTWARE/OS VERSIONS Operating System: Kubuntu 21.10 KDE Plasma Version: 5.22.5 KDE Frameworks Version: 5.86.0 Qt Version: 5.15.2 Kernel Version: 5.13.0-39-generic (64-bit) Graphics Platform: X11 ADDITIONAL INFORMATION Tried also by modifying ~.kde/share/config/kdeglobals With an addition in [General] BrowserApplication=/usr/share/librewolf/librewolf %u or BrowserApplication=librewolf As advised elsewhere.
I must mention that Kmail version is the following: KMail 5.18.1 (21.08.1) And on Kubuntu, it seems to be heavily modified/plugin.
The trick mentioned at the end (kdeglobal) is available here: https://lists.fedoraproject.org/archives/list/kde@lists.fedoraproject.org/thread/2IL6PGQW2TUPM47U3HWFLTWSTICIPCOU/