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+# Extensions
+
+Not every feature is relevant for all users, but some special features are relevant to the right person. That is why FreshRSS is extendable.
+
+There are some "official" extensions (supported and published by the FreshRSS development team and community) and "community" extensions (developed and published individually by third-party developers).
+
+## Extension repositories
+
+Most known extensions are listed in the front end: see configuration menu `Configuration/Extensions`.
+
+## How to install
+
+Upload the folder (f.e. `CustomCSS`) of your chosen extension into your `./extensions` directory.
+
+Result: Content of `./extensions/CustomCSS/` has f.e. `extension.php`, `metadata.json`, `configure.php`, `README.md` files and the folders `i18n` and `static`
+
+Important: Do not delete or overwrite the existing files `./extensions/.gitignore` and `./extensions/README.md`.
+
+## How to enable/disable and manage
+
+See in the front end: configuration menu `Configuration/Extensions`
+
+### User extensions
+
+Every user has to manage the extensions by themselves. Configuration via the gear icon is valid only for that user, not for other users.
+
+metadata.json:
+
+```json
+{
+  "type": "user"
+}
+```
+
+### System extensions
+
+Only administrators can enable/disable system extensions. The configuration via the gear icon is valid for every user.
+
+metadata.json:
+
+```json
+{
+  "type": "system"
+}
+```
+
+### pre installed extensions (core extensions)
+
+See folder: `.lib/core-extensions`
+
+Two system extensions are already pre-installed: `Google-Groups` and `Tumblr-GDPR`.
+
+Important: do not install your chosen extensions here!