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.

There is still a white flash, therefore it doesnt help.

It flashbangs - when opening new tab there's a flashbang of white, then switch to black. Defeats the whole purpose of this addon.

Simple and works. Thanks.

Just makes the new tab grey without any of the previous buttons still there.

This add-on was very helpful for me since I have floaters in my eyes and could see them very clearly with a white new tab, but a recent Firefox update made it so that this add-on delays keyboard input by 0.5 seconds, so that when I'm halfway done writing my search query, the new tab refreshes and I lose everything that I typed. It also seems that this functionality is in Firefox by default, so I went ahead and removed the addon. Thank you for developing this when I needed it!

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.

You still see a blinding flash of white when opening a new tab. Defeats the purpose.

Fait le travail mais une icône en forme de lune gâche un peu l'expérience. La possibilité de l'enlever pour la prochaine mise à jour ferait un 5 étoiles !

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!

It works well, but I wish it would open with my cursor in the search bar so I can start typing without clicking on it.

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.