I do not need popup reminders on my Mac Catalina about how you are discontinuing Flash. For Firefox and Safari I know that I still need it for music streaming. How those browser manufacturers are going to handle the need for Flash Player on some sites I do not know; but now I just downloaded the current version for Safari so I can stream through it. This is about the uninstaller that it wants me to download.
If you want to go through the trouble, you can suppress the EOL notifications by setting up the Enterprise Enablement features described on Page 28 of the admin guide, below:
To your other points, the browser manufacturers are removing support for all plugins. Content providers will need to update their sites to use solutions based on HTML5 and JavaScript if they want their sites to continue to work. Adobe and the major browser vendors published a joint notice about ending support for browser plugins, including Flash Player, back in 2017.
https://theblog.adobe.com/adobe-flash-update/
It's probably worth pointing out that Safari 14 drops support for Flash, so if your favorite sites are still working there, they might already have some kind of replacement built.
Installed copies of Flash Player will effectively stop working at the end of the year, and future browser updates will drop support for it. It's important to get security updates for software that processes untrusted content, like your browser and operating system, so you don't really want to be running old versions just to keep Flash running, if you can avoid it.
Just for convenience, I've included a link to the uninstaller for other folks that might be checking out this thread.
Uninstall Flash Player - Mac:
https://helpx.adobe.com/flash-player/kb/uninstall-flash-player-mac-os.html
Uninstall Flash Player - Windows:
https://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html
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