Extensions are new features that you can add easily to Dreamweaver. You can use many types of extensions; for example, there are extensions that let you reformat tables, connect to back-end databases, or help you write scripts for browsers.
To find the latest extensions for Dreamweaver, use the Adobe Exchange website at www.adobe.com/go/dreamweaver_exchange/. Once there, you can log in and download extensions (many of which are free), join discussion groups, view user ratings and reviews, and install and use the Extension Manager. You must install the Extension Manager before you can install extensions.
The Extension Manager is a separate application that lets you install and manage extensions in Adobe applications. Start the Extension Manager from Dreamweaver by choosing Commands > Manage Extensions.