Works great! What a nice relief to have plain, simple, non-eye-straining new tab pages. (Now if this Firefox site would only offer a dark version... :?P )
This extension will be even better we can choose our background colour (e.g. an even darker gray). The author's FAQ page says this is an upcoming feature.

Simple and works. Thanks.

My eyes and I want to thank you for this add-on

Dear Milen, I am so grateful to you for creating this amazing addon and sharing it with the world !
I had been waiting so many years for an addon just like this. Thank you so much :)

i removed the extensions few times, to always come back to it in the next 5 min.
a must addon.

Finally, best extension.

No permissions required. Has a nice intro page on installation. The new tab page is all dark (not incredibly dark) or all white (you can toogle it with an icon on the top left corner).

Saves my eyes. Essential add-on for lovers of dark themes on the newer Firefox versions with protected internal pages. Thank you so much!

新しいタブをabout:blankにするだけのアドオンです。
それ以外の機能はありませんが、これは私が探していたものです。
「Simple is Best」です。

Just what I was looking for. Hate all the crap on the default about:blank page.