Duckduck Bang is a subscription-based Firefox add-on designed to improve your internet search experience. It supports multiple search engines including Bing, Ecosia, Qwant, Google, and Startpage, allowing users to quickly access their preferred platforms with ease. One of its standout features is the ability to add custom bangs, which can be configured through the preferences page of the add-on, enabling more personalized search shortcuts.

Additionally, Duckduck Bang offers flexibility in its functionality by allowing users to change the default bang prefix, such as using '#' instead of the standard '!'. This customization enhances usability, making searches more intuitive and tailored to individual preferences. Overall, Duckduck Bang is a valuable tool for users looking to streamline their online search activities.