Works with Firefox 41 Rated 5 out of 5 stars

Just tried it on Firefox Nightly 41, had to modify to enable it but it works well with no problems

This review is for a previous version of the add-on (12.0.1). 

Flawless Rated 5 out of 5 stars

Great theme

This review is for a previous version of the add-on (12.0.1). 

Rated 5 out of 5 stars

An awesome theme that matches my system's GTK theme fairly well but it would be awesome if the developer also created his own GTK theme so it would match perfectly

This is how it looks currently
https://www.dropbox.com/s/i7rran5irkh2vvs/FT%20DeepDark.png?dl=0

This review is for a previous version of the add-on (12.0.1). 

Rated 5 out of 5 stars

"x" spot will work again after you disable "Use Firefox's built-in Session Restore feature" option in TabMixPlus

This review is for a previous version of the add-on (12.0.1). 

39.0a2 (2015-05-05) Rated 5 out of 5 stars

Im actually using
Firefox Developer Edition 39.0a2 (2015-05-05),
so i cant use this awesome theme t_t
I like the look of this theme, please make it
compatible with curent Firefox version.

This review is for a previous version of the add-on (12.0.1). 

Rated 5 out of 5 stars

Dark done right. What else needs to be said? Thank you to the creators!

This review is for a previous version of the add-on (12.0.1). 

Awesome in every way! Rated 5 out of 5 stars

I remember using this back in the days, and now that I'm back to Firefox this becomes one of my favorite thing about it.

Thank you for sharing your work!

This review is for a previous version of the add-on (12.0.1). 

Rated 5 out of 5 stars

Loving it

This review is for a previous version of the add-on (12.0.1). 

Rated 5 out of 5 stars

Beautiful black theme for Firefox and good for eyes.

This review is for a previous version of the add-on (12.0.1). 

Rated 5 out of 5 stars

Beautiful, good for eyes and it works perfect.

Thank you

This review is for a previous version of the add-on (12.0.1). 

Rated 5 out of 5 stars

Perfect. Do not change the black theme, is incredibly beautiful.

I used Google Translate lol. Brazil :D

This review is for a previous version of the add-on (12.0.1).  This user has 7 previous reviews of this add-on.

Rated 5 out of 5 stars

justo lo que buscaba

This review is for a previous version of the add-on (12.0.1). 

Rated 3 out of 5 stars

It's an extremely good looking theme but sadly it's not updated often enough for use with Aurora or Nightly, unless you feel like changing the maximum version manually every time.

If you use regular Firefox though, you're in for a treat, because it's without a doubt the best looking dark theme out there.

This review is for a previous version of the add-on (12.0.1). 

For your information, Aurora (Developer Edition) and/or Nightly compatibility is not an obligation for add-ons developers. This theme has been created with the main goal to support the regular Firefox, compatibility with higher versions is only a plus. I never stated in the add-on description it is supposed to work with all other versions of Firefox (neither with Firefox forked versions such as Palemoon, Waterfox, Cyberfox, etc.). I think it was already quite nice that for many years I spent time in trying to make my theme compatible with Aurora and Nightly when I had the possibility. It changes too often (especially Nightly which breaks the theme almost every other day) and I can't spend too much free time in fixing something which changes too frequently.
I do appreciate the fact that you like what I created, but please, if you want to review my add-on, review/rate it on what it is supposed to do, i.e. to change the appearance of the regular Firefox (for Windows and Linux) and not of all derived versions of it.

Wonderful Theme Rated 5 out of 5 stars

This theme is really good, keep up the good work!

This review is for a previous version of the add-on (12.0). 

Thank you

Awesome Rated 5 out of 5 stars

sürekli kullandığım bir temadır.efsaneee

This review is for a previous version of the add-on (12.0).  This user has a previous review of this add-on.

Rated 4 out of 5 stars

Hello,

Unfortunatly it's a little bit too dark, the same grey level as the interface ofphotoshop CS6 is more clear and usefull, can you think it's possible to do the same ?

all the best

This review is for a previous version of the add-on (12.0). 

nach DarkFox2 das Schönste Design - und Fehlerlos! Rated 4 out of 5 stars

Darkfox-2 ist zwar schöner (aktive Tabs sind dort besser sichtbar), aber Fehlerhaft: Es "verhindert" z.B. Googlebar lite!

Daher bin ich nun mit FT Deep Dark sehr zufrieden, da Alles - auch alle Add-Ons - unverändert weiter funktionieren.

This review is for a previous version of the add-on (12.0). 

Rdy77 Rated 5 out of 5 stars

Nicht schlecht, etwas andere form

This review is for a previous version of the add-on (12.0). 

Rated 5 out of 5 stars

this is the best skin for me and i think for everyone, if is posible make compatibility with firefox developer 38, i really miss this skin in that version of firefox, thx for all

This review is for a previous version of the add-on (12.0). 

Rated 5 out of 5 stars

I really like this theme but most of the time the bookmark/website tab icons are rather distracting since they're on a darker background. Is it possible to have a customizable fade effect or something similar on the toolbars? Something like this - http://i.imgur.com/8BSlWvk.jpg
-------
EDIT: Wow, I really should've been able to look alll this stuff up, but thanks for taking the time to respond and help out! It's exactly what I wanted.

This review is for a previous version of the add-on (12.0). 

Concerning the favicons, I created something called a "userstyle" to customize a bit the tabs. To use it, you need first to install an add-on called "Stylish" (there is a link in my add-on's description). Then, once you installed this add-on, you can apply the userstyle I created. The userstyle can be found here : https://userstyles.org/styles/94667/selected-tab-blue-font-color-for-ft-deepdark
This userstyle has been originally made to change the selected tab font color into a blue one, but you can customize few other things related with the tabs thanks to it. As for example, the text position (centered), you can also hide the favicons (it reappears when you hover the tab bar), remove the new tab "+" icon. If you don't like the blue text color, you can edit the userstyle and set yourself the color you want. If you also don't want the favicon to be totally hidden, you can also edit the opacity. For a bit more informations about how to edit the userstyle, read the userstyle "notes" on the userstyle page.
Thanks to the "Stylish" add-on and if you are comfortable with CSS code and the use of another add-on called "DOM Inspector", you can customize a lot of things yourself and make your Firefox to look exactly as you wish.

Now concerning the bookmarks bar, you can install another add-on called "autohide bookmarks". You can find it here : https://addons.mozilla.org/en-US/firefox/addon/autohide-bookmarks/.
It can allow you to reduce the amount of "distracting" ui elements and, at same time, to save space by avoiding the bookmarks bar to display. When you need to use it, you just need to push the "ctrl" keyboard button and hover the visible part of your browser with the cursor (i.e. the tabs bar, menu bar, navigation bar, etc.). This will allow the bookmarks bar to reappear.

Another solution, instead of using the "autohide bookmarks", could be to use another add-on called "The Fox, Only Better". You can find it here : https://addons.mozilla.org/en-US/firefox/addon/the-fox-only-better/.
It can allow you to only display the tabs bar and when you hover it with the cursor, it displays again all the hidden part of the browser.