I am no longer making enhancements to this add-on. This is the final product.
Bug reports should be submitted to my e-mail address (see "Support E-mail" link to the right). Using the reviews to report a bug, never to return to see my reply (usually asking for more info), rarely helps.
Also, please do not use the reviews to report errors when downloading the extension. That is not a problem with the extension, but with one of the AMO download mirrors. Please e-mail me instead.
This add-on no longer supports Thunderbird/SeaMonkey! Legacy users should stay on version 2.3.1. Please find it at
Simple Clocks lets you track the time in locations around the world! Or simply display your own time/date. The display is highly customizable, including flag, font and color options.
It is lightweight (~ 140 kb, compared to FoxClocks ~ 750 kb!), and easy to use.
Timezone data used by Simple Clocks is culled from the tz database, the de facto standard for timezone and daylight savings time information.
My timezone data is hosted, via Bitbucket, by Amazon Web Services.
Simple Clocks can display the locations you are tracking in a tooltip, the toolbar, or both.
Clock and options data can be synced across different computers (if you are syncing your bookmarks).
You can set alarms on any location to receive a notification at a specified time.
Please visit my homepage for more information, and details on usage (particularly the Locations page). Documentation is also available from the context menu, or Help buttons on dialogs.
My website also has a Development Builds page, which may have a beta of the next version available for downloading.