Add a select Timezone in the icon menu on the panel. When I switch proxies / vpn I need to go to add-on management to switch Timezone. But then you put the check page in the icon. Don't you think it's a little through the ass? =) I myself know where to check the time, I need to switch it, and not look at the clock.

For example, 4-5 presets in the menu would suit me perfectly.