I am using multiple virtual desktops under Kubuntu. I am running Kubuntu 24.10 having just upgraded from Kubuntu 24.04. After the upgrade, when I click on email links in Thunderbird, a new tab is created in my Firefox window but the focus does not switch to the Firefox desktop and window as it has always done in the past. This is especially annoying since I run Thunderbird and Firefox in different virtual desktops. So, after clicking on a link, I then have to switch virtual desktops in order to see the link's webpage in Firefox. I've done some testing and I suspect that this problem is specific to Firefox. That is, when I use Chrome instead of Firefox then the Thunderbird link works properly and changes the focus to the desktop and window with Chrome running as it should. I have tested this problem on my installation and on a fresh installation. In both cases, the focus does not switch to the desktop with Firefox when Firefox is set to the default browser. Likewise, in both cases, the focus switches properly to the desktop with Chrome when Chrome is set to the default browser. My google searches indicated that, in the past, this type of issue has been related to xdg activation bugs or configuration issues under Wayland on Linux. In other words, this looks like a Firefox bug in Kubuntu. Does anybody know where I should seek support and file a bug report for this? With Mozilla or Kubuntu or Ubuntu? Does anybody have any other ideas? How do I fix this? Thanks, Gordon