Userscript to highlight visited watched threads

[Troopy]

Wanted to share this userscript I found on Greasyfork. It keeps track of visited links on QQ but also SB/SV and highlights them. There are more features on the description page, but the basic highlight is already invaluable. I can tell at a glance what links I already read or follow, which makes discovering older threads so much easier.
It has so few views, I hope that someone else will find it useful as well.