@ku1ik I've been running all my foxes, & recent fork ​, as full-W for ages [maybe a year] via the #Wayland environmental variable prepended to the launch command [except ​, which has been full-W natively for yonks now]. However, last night i was thrilled to discover that in parallel with the #Firefox devs' progress, the wonderful #KDE devs' ongoing incremental changes to #Plasma 5.27.x have culminated now in finally all my foxy #PiP windowlets respecting my #WindowRules, such that at last they now play nice & stay on all desktops, & on top, purely via my rules, & no longer needing my manual intervention every single time. This is nice! 🎉​