Phew, I'm glad that's sorted itself out
Fire polished = rounded edge.
So, usually shades are fire polished, rather than ground with, or without polishing.
For instance, the top of the base to a pre-war mushroom lamps is ground for the fitting, but the rim to the shade is fire polished (rounded). However, post war 'flange' lamps have both base and shade fire polished. This is the 'rule of thumb'. Just so that it's clear to non officionardos!