Dennis
Sorry to hear about your fall, been there done that, rain on slippy floor, knee & wrist damaged but not to bad.
Tosh asked about feet, you described yellow ones, i,d say that they were the factory fitted, thats the ones most have had accidents on.
He means proper safety feet these cost about £25.00 a pair & your ladder should never move. I have fitted them to all A ladders aswell, as a precaution.
Also a lot of window cleaners are using extending poles, try them on awkward windows, you can reach 3 storey no problem, same again only a small investment & your safe, but, look to poles for the future, but invest in the present before you have another accident.
Gary