Very good! Rated 5 out of 5 stars

Best black theme.

This review is for a previous version of the add-on (14.3). 

Very beautiful! It is very beautiful Firefox with this theme! Rated 5 out of 5 stars

Best theme for Firefox, very good, very beautiful! Thank you for developing this beautiful theme!

This review is for a previous version of the add-on (14.3). 

Awesome Rated 5 out of 5 stars

Works fine.
Firefox 52.0.2

This review is for a previous version of the add-on (14.3). 

Most space-efficient Rated 5 out of 5 stars

I love maximizing my screen real-estate, and this hands-down the best theme for such a purpose. I only wish there was a light version as well for daytime browsing.

This review is for a previous version of the add-on (14.3). 

The best one. Rated 5 out of 5 stars

Thanks.

This review is for a previous version of the add-on (14.2.7).  This user has a previous review of this add-on.

Real usable theme Rated 5 out of 5 stars

Fully functional dark minimal theme

This review is for a previous version of the add-on (14.2.7). 

Amazing! Rated 5 out of 5 stars

Great theme! Minimalistic and cool!

This review is for a previous version of the add-on (14.2.7). 

Amazing Rated 5 out of 5 stars

Highly recommend this looks so good, and saves your eyes from all the whiteness in UI of this browser.

This review is for a previous version of the add-on (14.2.7). 

Excellent thème Rated 5 out of 5 stars

Très beau thème dark qui s'intégre parfaitement dans firefox, bravo aux dev !

This review is for a previous version of the add-on (14.2.7). 

I LOVE THIS THEME Rated 5 out of 5 stars

best firefox theme! used it years ago until it became incompatible after a firefox update. so glad to discover it already updated and compatible with the latest firefox version!

This review is for a previous version of the add-on (14.2.7). 

Great topic Rated 5 out of 5 stars

Для меня пока что лучшая тема. Спасибо!

This review is for a previous version of the add-on (14.2.7). 

Best Dark theme so far Rated 5 out of 5 stars

Its an indispensible addon for those who like light-text-on-dark-bkgd themes like Twilight, Monokai, etc.

This review is for a previous version of the add-on (14.2.7). 

Works perfect with windows 10! Rated 5 out of 5 stars

I'm a user of pentadactyl and always looking for a dark theme until this one. I will keep this one as my only choice!

This review is for a previous version of the add-on (14.2.7). 

Great Theme, but one problem Rated 5 out of 5 stars

This is my all-time favourite Firefox theme and I am using it since multiple years, but I have encountered a problem:

As of Firefox 53 (beta) the media playback UI is broken.

Enable the theme and play a simply mp3 file via firefox, you will notice that the media playback UI is broken.

It would be nice if this could be fixed :)

This review is for a previous version of the add-on (14.2.7). 

Best dark theme Rated 5 out of 5 stars

Great theme, great and so clean.

This review is for a previous version of the add-on (14.2.7). 

Best theme for firefox Rated 5 out of 5 stars

i am using this theme since the early versions of firefox and i am very satisfied!

This review is for a previous version of the add-on (14.2.7). 

The ONLY FireFox theme! Rated 5 out of 5 stars

I`ve been using FT DeepDark for more years than I can remember, perhaps 5 or 6, and it is simply the ONLY theme I will ever need. Deep, dark, clean and cool. I DARE you to try it and not LOVE it. Huge thanks to the dev, Steva, for making my iNet time so much sweeter.

This review is for a previous version of the add-on (14.2.7). 

Sharp, clean, compatible - best dark theme for FF on Win Rated 5 out of 5 stars

If you want your Firefox dark and handsome, without a lot of flashiness, this is the theme for you. No background graphics, no shiny gradients, just pleasantly dark with good visibility, just enough customizability, and compatibility with lots of common extensions and settings. (It works great with TabMixPlus, for example.)
The developer keeps it pretty well updated and is responsive to questions and requests.
I cannot recommend FT DeepDark highly enough for every installation of Firefox on Windows.

This review is for a previous version of the add-on (14.2.7).  This user has a previous review of this add-on.

Flawless on its own and with lots of other extensions Rated 5 out of 5 stars

Simple, clean, comprehensive, and best of all, highly compatible. I use Tab Mix Plus, The Addon Bar, Tile Tabs, Tab Tweaks, etc. - these change the shape, size, behavior, and more of the UI. FT DeepDark handles it all without skipping a beat, unlike several of the most popular and best-rated dark themes out there.

When FF updates, this theme may appear to be 'incompatible', but immediately or shortly after, it can be reinstalled without issue. I'm not sure if this is a bug on FF's part, if the version-matching is too strict, or if there are actual incompatibilities that the developer (Steva) needs to fix, but like I said, the delay is never long. (Only) in the interim where this theme is unavailable, I recommend NASA Night Launch.

This review is for a previous version of the add-on (14.2.7). 

I'd given up on themes Rated 5 out of 5 stars

I'd given up on themes, all of them seemed to me as simple and basic colour changes. Want flowers? or a animal? or maybe some cool art try my theme!?. They seemed so... basic. This one on the other hand is worth of the name theme the shapes and icon are all different. And it leads to a crisp clean modern look. 10/10

This review is for a previous version of the add-on (14.2.7).