It works for me. see screenshot X11 or Wayland? 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 Also see what happens under different users. Another trick would be to test your OS on a live usb stick. You can also try Refresh Firefox. https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings

Operating System: openSUSE Tumbleweed 20250427 KDE Plasma Version: 6.3.4 KDE Frameworks Version: 6.13.0 Qt Version: 6.9.0 Kernel Version: 6.14.4-1-default (64-bit) Graphics Platform: X11 Processors: 12 × Intel® Core™ i7-9850H CPU @ 2.60GHz Memory: 125.1 GiB of RAM Graphics Processor: Intel® UHD Graphics 630 Manufacturer: HP Product Name: HP ZBook 17 G6

Run this also. lpstat -t see my results in screenshot

Thanks for your comments. Perhaps you missed that I have exactly the same problem with Thunderbird as well. And I have no problem printing with other apps on that system. Printing works with un-Googled Chrome, Evolution, etc. I also have several other systems on different machines: Ubuntu on this machine I'm replying on, another on iOS, two others on Android/Graphene. All of those print as well, where applicable. So I'm sure SUSE works, too. This problem cropped up about 3~4 weeks ago. Prior to that, I could print with no problem in Arch; Firefox or Thunderbird, and have done so numerous times. I suppose it occurred after some general update, as I generally run a system update each week, and on Arch, there may be 250 or more updates each time, too many to track. A particular update could have included Firefox and Thunderbird, or some other system component, but I wouldn't have immediately noticed. I don't think the problem is directly due to OS or any add-ons, but something core and common to both of the Mozilla installations. While the attached images were taken from Firefox for simplicity, the same dialog and failure occurs with Thunderbird (sorry, I'm repeating myself!). So I suggest an issue common to both. Not sure what that could be... And, since you asked, I use X11 exclusively on all Linux machines. Can't stand Wayland :-) But I tried booting into Wayland on the Arch machine, and experienced the same problem with the "stuck" print dialog, even when asking for just a Print Preview. 'lpstat' shows all's well: 2 printers; cups-pdf, and a remote color laser printer, both idle and accepting input. The cups web interface shows no problems (and works for everything else, as stated).

Did you try this? see screenshot 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

I will look into that, but I tried the "Clear Saved Print Settings" before, with no effect. Re-installing Firefox won't likely fix Thunderbird...

What are you seeing in the journald logs when you try to print?