1# Extensions
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3Zed lets you add new functionality using user-defined extensions.
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5- [Installing Extensions](./extensions/installing-extensions.md)
6- [Developing Extensions](./extensions/developing-extensions.md)
7  - [Developing Language Extensions](./extensions/languages.md)
8  - [Developing Themes](./extensions/themes.md)
9  - [Developing Slash Commands](./extensions/slash-commands.md)