https://eugene-andrienko.com/it/2026/01/22/freebsd-15-0-xlibre.html
I saw XLibre updates for this installation near 2 or 3 times, updated and met zero problems (as it should be).
But, I should note, that with XLibre version mentioned in blogpost there were some big problems with VirtualBox GUI (IIRC). Don't know, maybe it was fixed in the new releases.
I don't use VirtualBox, so can't check it.