diff --git a/4.1-Extensions.md b/4.1-Extensions.md
index d511f9b..1d7ce5e 100644
--- a/4.1-Extensions.md
+++ b/4.1-Extensions.md
@@ -40,7 +40,9 @@ This list covers privacy and security related extensions only. While we believe
- an extra layer of isolation, see [bugzilla 1767271](https://bugzilla.mozilla.org/1767271)
- signing in to multiple accounts on the same site
- MAC and Mozilla VPN adds [advanced VPN and proxy settings](https://support.mozilla.org/en-US/kb/use-multi-account-containers-mozilla-vpn)
- - While TC provides sanitizing, and uses a [dFPI-compatible API](https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/API/contextualIdentities/remove), this is not why it is recommended as optional, see `Cookie extensions` in the `DON'T BOTHER` section below
+ - about TC
+ - TC is [no longer being developed](https://github.com/stoically/temporary-containers/issues/618)
+ - While TC provides sanitizing, and uses a [dFPI-compatible API](https://developer.mozilla.org/docs/Mozilla/Add-ons/WebExtensions/API/contextualIdentities/remove), this is not why it is recommended as optional, see `Cookie extensions` in the `DON'T BOTHER` section below
* [Request Control](https://addons.mozilla.org/firefox/addon/requestcontrol/) | [github](https://github.com/tumpio/requestcontrol) | [manual](https://github.com/tumpio/requestcontrol/blob/master/_locales/en/manual.wiki) | [testing links](https://github.com/tumpio/requestcontrol/wiki/Testing-links)
* [Redirector](https://addons.mozilla.org/firefox/addon/redirector/) ✔ [privacy](https://github.com/einaregilsson/Redirector/blob/master/privacy.md) | [github](https://github.com/einaregilsson/Redirector)
* [Smart Referer](https://addons.mozilla.org/firefox/addon/smart-referer/) ✔ [privacy](https://addons.mozilla.org/firefox/addon/smart-referer/privacy/) | [gitlab](https://gitlab.com/smart-referer/smart-referer) | [github: archived](https://github.com/meh/smart-referer)