From a reader:
Is it permissible for a priest to load a thurible whilst sitting? I
thought I heard only a bishop was allowed to load the thurible sitting and the priest must stand.
I can’t off the top of my head think of a moment in the Extraordinary Form when the priest would load, or charge, the thurible while seated. However, when I was frequently celebrant for “high” Masses at St. Agnes in St. Paul, before the Gospel I would charge the thurible while seated. I am not sure that that was properly done, since I believe this is an episcopal privilege, but that is what we did. When I am celebrant I obey the MC.
However, the priest (and deacon) can always load his Beretta when seated, which is a good idea as the smoke clears.