diff --git a/docs/index.md b/docs/index.md
index 690e47c..c9a5fcd 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -51,7 +51,6 @@ members can be use your email credantials for login. (*username@envs.net* | *you
     - [whiteboard](https://pad.envs.net/whiteboard/)
     - [file drop](https://pad.envs.net/file/)
     - [contacts](https://pad.envs.net/contacts/)
-- [ffsync](https://help.envs.net/tutorials/ffsync/) - firefox sync server
 - [tt-rss](https://rss.envs.net/) - news feed reader and aggregator
 - [ip address info](https://ip.envs.net/)
 
diff --git a/docs/tutorials/ffsync/index.md b/docs/tutorials/ffsync/index.md
deleted file mode 100644
index 2da39a7..0000000
--- a/docs/tutorials/ffsync/index.md
+++ /dev/null
@@ -1,39 +0,0 @@
-# envs's firefox sync server
-
-**url: `https://ffsync.envs.net/`**
-
-do you use firefox on multiple devices for browsing? then you can use firefox Sync to synchronize your browser data (bookmarks, open tabs, search history, etc.) between all your devices.
-
-for this you first need a firefox account.
-
-## client configuration
-
-if you are logged into firefox with your firefox account, log out!
-
-### desktop
-
-to configure desktop firefox to talk to our sync server, go to [`about:config`](about:config), search for `identity.sync.tokenserver.uri` and change its value to be the url of our server with a path of `token/1.0/sync/1.5`:
-
-`identity.sync.tokenserver.uri: https://ffsync.envs.net/token/1.0/sync/1.5`
-
-after the new sync server is stored, restart firefox (i.e. close it and open it again).
-
-you can now log in your firefox account again.
-
-### android
-
-firefox for android ("daylight", versions 79 and later) does support using a non-mozilla-hosted sync server.
-go to "App Menu > Settings > About Firefox" and click the logo 5 times. you should see a "debug menu enabled" notification. go back to the main menu and you will see two options for a custom account server and a custom sync server. set the sync server to the 
-url: `https://ffsync.envs.net/token/1.0/sync/1.5`
-and then log in.
-
-to configure android firefox 44 up to 78 to talk to our sync server, just set the "identity.sync.tokenserver.uri" exactly as above before signing in to firefox accounts and sync on your android device.
-
-**important:** after creating the android account, changes to "identity.sync.tokenserver.uri" will be ignored. (if you need to change the uri, delete the android account using the "Settings > Sync > Disconnect…" menu item, update the pref, and sign in again.) non-default tokenserver url's are displayed in the "Settings > Sync" panel in firefox for android, so you should be able to verify your url there.
-
-prior to firefox 44, a custom add-on was needed to configure firefox for android. for firefox 43 and earlier, see the blog post [how to connect firefox for android to self-hosted firefox account and firefox sync servers](http://www.ncalexander.net/blog/2014/07/05/how-to-connect-firefox-for-android-to-self-hosted-services/).
-
-## links
-
-- [firefox sync](https://www.mozilla.org/de/firefox/accounts/)
-- [source](https://github.com/mozilla-services/syncserver)
diff --git a/mkdocs.yml b/mkdocs.yml
index cd93637..1df5af0 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -38,7 +38,6 @@ nav:
         - gemini: gemini.md
         - finger: finger.md
     - tutorials:
-        - ffsync: tutorials/ffsync/index.md
         - bash guide: tutorials/bash-guide/README.md
         - learn git:
             - home: tutorials/learngit/docs/index.md