Cost / License
- Free
- Open Source
Platforms
- Mozilla Firefox


VivaldiFox is the most popular Open Source & free alternative to Geckium.
- VivaldiFox is Free and Open Source
Geckium is described as 'Mozilla Firefox (115 - latest) CSS and JS modification that restores the look and feel of past Chromium (or Google Chrome) releases, spanning from 1' and is an app. There are six alternatives to Geckium for a variety of platforms, including Mozilla Firefox, Windows, Linux, Mac and Flathub apps. The best Geckium alternative is VivaldiFox, which is both free and Open Source. Other great apps like Geckium are Add Water, Firefox Color, ShadowFox and Personas Plus.


VivaldiFox is the most popular Open Source & free alternative to Geckium.
A utility app to easily install the GNOME for Firefox Theme and automatically update it in the background. This theme keeps Firefox fashionable within the GNOME design ecosystem, and provides many helpful features to customize the interface to make browsing even more pleasant:




Add Water is the most popular Linux alternative to Geckium.



Firefox Color is the most popular Windows & Mac alternative to Geckium.
This project aims at creating a universal dark theme for Firefox while adhering to the modern design principles set by Mozilla.




Personas are free, easy-to-install "skins" for Firefox. Personas Plus extends that built-in functionality to give you even more control and easier access to new, popular, and your own favorite Personas.



