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Update 08-07-2012 »LCD Clock Extension 0.4.2
This thread »[Extension] LCD Clock v0.2 will help you add a clock to your FireFox browser.
You can find a zipped file with everything you need to get setup like in the picture below. LCD Clock
This clock is user configurable by using the userChrome file in FireFox. You will be able to customize it to your liking.