This works for me. see screenshot

https://www.duelingbook.com/

Looks like you have 1 too many Ls in the address. If no other questions, mark it as resolved and get back to it.  ;-))

Operating System: openSUSE Tumbleweed 20260103 KDE Plasma Version: 6.5.4 KDE Frameworks Version: 6.21.0 Qt Version: 6.10.1 Kernel Version: 6.18.2-1-default (64-bit) Graphics Platform: X11 Processors: 12 × Intel® Core™ i7-9850H CPU @ 2.60GHz Memory: 128 GiB of RAM (125.1 GiB usable) Graphics Processor: Intel® UHD Graphics 630 Manufacturer: HP Product Name: HP ZBook 17 G6 System Version: SBKPFV3

I did accidentally add one too many l in the address while typing it out in the message, but the website still does crash firefox when using it. This is not resolved.

Okay. I'm on another computer and not seeing the issue with my distro version nor Mozilla version of Firefox.

What desktop? Does it happen on a different desktop? X11 or wayland? Does it happen on your OS via a live usb stick? https://wiki.archlinux.org/title/USB_flash_installation_medium

You can also run strace to see what happens when it goes boom and then open a bug to have devs look at the results. strace -t -o firefox_debug.txt firefox & The 2nd screenshot shows why the browser closed in the output file firefox_debug.txt.

Try downloading Firefox from Mozilla. Download, unzip, and run firefox-bin from the folder and see if you have the same issue. https://www.mozilla.org/en-US/firefox/all/#product-desktop-release

Operating System: openSUSE Leap 15.6 KDE Plasma Version: 5.27.11 KDE Frameworks Version: 5.115.0 Qt Version: 5.15.12 Kernel Version: 6.4.0-150600.23.81-default (64-bit) Graphics Platform: X11 Processors: 16 × AMD Ryzen 7 PRO 6850HS with Radeon Graphics Memory: 62.1 GiB of RAM Graphics Processor: AMD Radeon Graphics Manufacturer: HP Product Name: HP EliteBook 865 16 inch G9 Notebook PC