This extension is 4 years old, and it works without any update in the current Firefox versions. This speaks for the brilliant skills of the programmer of this extension. I use this extension daily in my browser to check the time in between. I am always surprised at how reliably this extension displays the time and date. Besides, I like the simple design of this extension without any frills. In short, this extension always delivers what it promises in a simple look. I have had this extension for 4 years and after 4 reliable years, I thought it is about time I write a good review.

It is exactly what I need

I love the simplicity--Best clock yet.

Great!
I often use Firefox in MacOS FullScreen mode, therefore great to have a clock at sight (and ignore the rest of MacOS)!

Suggestion: Add some preferences to further define the visual styling: The full black bg is pretty heavy. I would love set it to transparent bg with black font. Also would position center aligned instead of top aligned.

Tiny but effective.

--EDIT--: The dev has updated their addon to allow the option for a 12 hour clock. Thank you so much!
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--[Original review]--
I would love the option to switch to 12 hour instead of 24 hour, but otherwise this is very functional and eyecatching. This addon doesn't require any unneccesary permissions either, which is a win in my book.

I wanted a simple, readable at a glance, Toolbar clock, This is perfect. Thank You.