Firefox doesn't handle links from other programs correctly.

I'm using Firefox on Fedora 43 Linux, fully updated, and have it set up to use four desktops on the same monitor, using the Xfce DE and Compiz. For the last several months, any time I click in a link in Thunderbird, instead of switching to the desktop with Firefox on it, it pulls Firefox to Thunderbird's desktop and covers Thunderbird. This has continued through several updates of Firefox and at least one upgrade of Fedora. I don't know if Firefox or Xfce is the issue, but if it's Firefox, where do I look?