Up until FF upgraded 93.0 (64-bit) with both Win-10 & 7 (on PC), this has been a 5-star rating. It actually still is. Grateful and thankful for the author's work on this.
Currently I would consider this a broken app, because yahoo has found a way to push their right side ads again. The screen is being occupied by their garbage again.
They have also been able to temporarily push their small ad area above the subject lines (shows up for a few seconds, then goes away).
This has been an exemplary program. I am hoping that the author can find a way to smack down yahoo again.