Global Speed is a subscription-based multimedia extension designed for Firefox that enhances audio and video playback across various streaming platforms. It supports popular services like YouTube, Netflix, and Spotify, allowing users to apply a uniform speed to their media. Key features include customizable shortcuts for rewinding, forwarding, and marking specific timestamps in videos, making it easier to navigate content. Users can also manipulate playback speed or apply filters like invert and grayscale for a personalized viewing experience.

In addition to playback controls, Global Speed provides tools for drawing on the page and darkening video backgrounds, enhancing user interaction. The extension includes a powerful URL rule system that enables users to set specific speeds or filters based on the website. This flexibility makes Global Speed a versatile tool for anyone looking to optimize their multimedia consumption.