Fixed Zoom is a Firefox extension designed to address the limitation of default zoom settings in the browser. It allows users to set a custom default zoom level, ensuring that all websites load at a preferred scale rather than the standard 100%. This feature is particularly beneficial for users who require larger text or images for better readability. Additionally, the extension provides the option to customize zoom settings for specific websites, enhancing the overall browsing experience.

The extension operates on a subscription-based model and utilizes two key permissions: storage and website access. The storage permission enables the saving of individual zoom preferences, while the website access permission is utilized to match specific zoom rules with the currently visited site. This functionality ensures a seamless integration into the user's browsing habits, making Fixed Zoom a valuable tool for personalizing web content.