The fact that shrink-wrapped agreements aren’t automatically void worldwide is a fucking abomination. No you shouldn’t get to push a legally binding contract on me after I paid for the product. It’s my property now and if you want to require a license agreement after the sale then I should be able to decline it for a full refund fuck you.
I’ve said it before and I’ll say it again. If your site doesn’t work on Firefox your site doesn’t work. As web developers your job is to develop applications for the web not for one specific browser. This goes double for essential services.