I love that I can just drop it right onto my bookmarks bar! At a glance time for minimal real estate.
Clicking it cycles through various colours and between 12/24 hr formats.

It gets 5/5 stars for fulling its mission statement wonderfully well.
I would personally love an option to set a background colour also, and maybe make the time a display standard, rather than its 2 tiered (space saving) default.

Perhaps I am doing something wrong. I've installed the clock in the toolbar on 57. The puzzle piece icon is there and when I click on it nothing happens. When I hover it says "Small Clock" but that is all it does. What am I doing wrong?......Never mind, a restart fixed it. Would be nice to control the font size.

Really nice and useful extension, especially the compact view.

4 stars, this addons is what I need in full screen mode. However, the font is small and I want little bigger.

I am using your addon and I like it. But, please, prepare for Firefox 57. I like seeing time in Firefox. Thank you for your efforts.

Does what it says, it's very simple and small. the only option available is to change the color.

the term "fullscreen browser use" might be misleading to "display the window in full screen (f11)", but it does what it says: the browser in fullscreen, means no Windows(OS) toolbar, so it's okay.

A nice little addon, but hard to read as the space it occupies is that of a simple icon.

Minimal. Nothing more than the time on the toolbar. Thanks!