diff --git a/3rd-Party-Ports.md b/3rd-Party-Ports.md
index 3c58cac..9635997 100644
--- a/3rd-Party-Ports.md
+++ b/3rd-Party-Ports.md
@@ -22,6 +22,14 @@ Third party TV interface for YouTube. Supports auto skip, manual skip and seek b
 
 --------------------------------------
 
+#### Userscript:
+
+[sb.js](https://github.com/mchangrh/sb.js) by [@mchangrh](https://github.com/mchangrh)
+
+Userscript and bookmarklet. Skipping is less precise than the extension.
+
+--------------------------------------
+
 #### [MPV Media Player](https://mpv.io/):
 
 [MPV_SponsorBlock](https://github.com/po5/mpv_sponsorblock) by [@po5](https://github.com/po5)