Add Custom Search Engine is a Firefox extension designed to empower users by allowing them to create and manage personalized search engines directly in their browser. This tool offers a range of customization options, including the ability to set a unique name, search URL, and additional parameters such as icons and descriptions. Accessing this feature is simple, with a dedicated button next to the URL/search bar or through the options menu in about:addons.

A key feature of this extension is its reliance on a third-party service to store the data for custom search engines, which is necessary due to technical limitations of Firefox WebExtensions. While this requirement may raise privacy concerns for some users, the extension remains a valuable tool for those looking to enhance their search functionality and tailor their browsing experience to meet personal preferences.