After installing Flash10 player; the installer integrated it into IE (which was where I'd started from).
I assumed it would also have been integrated into my Seamonkey, and Chrome browsers.
Not only is this assumption false; attempts to install it explicitly also fail with a message to the effect that the browser is in use, and therefore conflicts with the installer. This is confusing because I rarely use more than one browser at a time, and even less rare that both browsers be pointed to a site with an SWF running.
How to integrate the Flash Player installation with multiple browsers on a given computer?