Reddit Keyword Filter is a subscription-based extension for Firefox designed to enhance the user experience on Reddit by allowing users to filter out posts containing specific keywords. This simple yet effective tool enables users to manage their Reddit feed by excluding unwanted content, including advertisements. Users can easily add or modify keywords according to their preferences, and there are predefined options available for political content, making it easier to tailor the viewing experience.

The extension requires storage permissions to save user-defined keywords and settings, along with host permissions to interact with Reddit's content. It is important to note that while the extension aims to filter posts effectively, there may be instances where some posts still appear despite the applied filters. This tool is open-source, with its code available on GitHub for users interested in contributing or customizing their experience.