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FoxClocks is an extension that will show multiple clocks in the browser's statusbar, toolbars or menubar for any of hundreds of cities around the globe, using a database of time zone and daylight saving information.
You can set each clock's colour, or even have a clock change colour during certain hours (perhaps green when it's a good time to Skype your friends in Japan). Too much stuff in your statusbar? Move your clocks to a toolbar, or switch to 'icon' mode and hover over the FoxClocks icon to see your clocks.
FoxClocks' Zone Picker tree lets you browse virtually all the world's time zones by country, region or city. Enable automatic database updates and you'll always have the right time.
Requirements:
· Firefox: 3.0 and later
83; Thunderbird: 3.0 and later
· SeaMonkey: 2.0 and later
What's New in This Release: [ read full changelog ]
· Time zone database updated to 2012c (2012-03-27) for users who have disabled automatic time zone database updates. (Note: as of 2012-05-11, time zone database updates are not working; we hope to resolve this issue as soon as possible. This should not affect FoxClocks functionality significantly.)

Via: FoxClocks 2.9.38