diff --git a/thunderbird/README.md b/thunderbird/README.md
index a69f076..950a457 100755
--- a/thunderbird/README.md
+++ b/thunderbird/README.md
@@ -1,5 +1,7 @@
 # Thunderbird
 
+> Since Thunderbird 115.0, necessary [low-level interfaces are not available anymore](https://www.thunderbird-mail.de/forum/thread/92154-allow-html-temp-for-thunderbird-115/) preventing _Allow HTML Temp_ extension to work which might lead you to skip Thunderbird entirely.
+
 You can just copy the `user.js` into Thunderbird's app data directory, e.g. `%AppData%\Mozilla\Thunderbird\profileName` or `~/.thunderbird/profileName` _or_ go to `Settings -> Advanced -> config editor` when editing values manually.
 
 ## Addons