Startup Theme Changer is a Firefox add-on designed to enhance the personalization of your browsing experience. This subscription-based tool automatically changes the active theme each time the browser is launched, offering users a fresh look each session. Users can choose to select themes randomly or follow a predetermined rotation from their list of installed themes. Additionally, it provides the flexibility to exclude Firefox's built-in themes, such as Default, Light, Dark, and Alpenglow, ensuring a tailored experience for every user.

Inspired by the Personas Shuffler, this add-on allows for seamless integration into daily browsing habits. Its simple yet effective functionality makes it easy for users to engage with a variety of visual styles without manual adjustments. The ability to customize how themes are applied adds a layer of convenience, making it ideal for those who prefer a dynamic interface while using Firefox.