This mandatory upgrade completely illustrates the point of why so many never did. Upgrades tend to lose functionality- add-ons, etc, that we're accustomed to and still work quite well with don't function anymore with browser upgrades, and there's no viable replacement available so we stick with what works and find other ways to compensate for any perceived vulnerabilities. Now, like Microsoft, you're forcing consumers to do things they never wanted to and taking away the reasons for using this browser to begin with. Given that we've been able to use older versions for years with no issues, there's no sugarcoating that this is all on you, Mozilla. Calling this course of action disappointing is a gross understatement and nothing more than keeping things polite.