Stylebot is a Firefox extension designed for web development and customization. It allows users to easily modify website elements by changing fonts, colors, margins, and visibility through a user-friendly interface. Additionally, users can manually write CSS to achieve more specific styling. The extension is subscription-based and offers a seamless experience, with changes saved instantly, making it ideal for quick adjustments.

Key features include a readability mode that enhances article readability by removing non-essential elements, and a grayscale mode that minimizes eye strain by converting pages to grayscale. This extension is particularly useful for users looking to personalize their web browsing experience or improve the accessibility of web content.