In the past we made quite a few hacks for Firefox, to extend its features or to make it more fun. Now we decided to turn our hacks into a native addon for Firefox. And we believe it was the right choice because after all, the app’s biggest weakness is the lack of features.

We know that it's hard to create a popular app for Android and iOS, so we decided to build one for Windows users first.

So what's inside the app?

The app's UI is clean and very minimalistic, to avoid cluttering the screen with huge buttons. It's designed to look cool even on phone screens.

Custom CSS Injector is simple to use, yet powerful, letting you change the CSS rules of websites in seconds. It offers a unique way of developing modern web browsers.

And you can still use it to fix things you messed up.

What's New

In this release, we've added new presets, an improved UI, and a new feature.