The Firefox extension is only there to make it easier to set you.com as the default search engine in the browser. It is possible to do this manually by changing settings, but a lot of our users would prefer to just install an extension instead. Link: https://addons.mozilla.org/en-US/firefox/addon/you-com/.
The desktop Chrome extension (https://chrome.google.com/webstore/detail/youcom-search-chat...) has some additional functionality. It lets users easily switch their default search engine between you.com, our new youchat feature, and our youcode mode. It also has quick shortcuts to some of our most popular apps, like YouImagine (which is an image generation app, like Stable Diffusion).