GX Mods is a multimedia extension for Firefox that introduces the iconic sound effects and background music from the Opera GX browser, allowing users to customize their browsing experience. This subscription-based add-on features a wide array of options, including pre-installed mods and the ability to create or download additional content from the GX Store, all aimed at enhancing user engagement through audio-visual elements.

With the latest version 6.0.0, GX Mods provides a user-friendly interface for managing themes and web mods. The extension requires specific permissions to utilize browser tabs and download history for its audio features, functioning optimally in normal browsing windows. While it enriches the auditory experience, it maintains user privacy by not accessing personal data beyond what's necessary for operation.