I block flash by default on my desktop computer. I turn it on for youtube. The main reason for me using flash-block extension on Firefox is to void out annoying advertising
https://addons.mozilla.org/en-US/firefox/addon/flashblock/
Think Flash should assassinated myself but, it still lives because it’s cheaper. I hate Flash knowing there are better techs but, even today there are people using XP based machines. in fact, I recently gave one to a friend and he was happy I didn’t give him a New computer, as he would to learn the New OS and he couldn’t bear it.