This works well.

But as the other person stated it does not save your preferred time zone after restarting your Browser " possibly may be because of private browsing option in Firefox".
www.ip-score.com see's your connection as no possibility of spoofing your ip address if the time zones match with your VPN and Spoof Timezone, but if you restart your browser Spoof Timezone puts in a default or random time zone and then Ip-Score sees it as a 20% chance that you are spoofing your Ip address because the timezones do not match, but it still masks your real timezone.

Most do not realize you can have all the spoofing, VPN, Proxy, and safety blockers in the world but if your Browser is leaking your real Timezone, it can narrow down your location to a Country, State, or even City depending on where you live.

This little plugin stops that.

So it is a great little Plugin " thank you Joue Quroi ", it would get 5 stars if it saved the chosen timezone when the browser is restarted.