In the “Help” tab, by clicking on the website link or the forum, I get information: “This site is trying to open TeamSpeak Client”
Displayed website addresses:
h … s // tmspk.gg / home? s = ts3
h … s // tmspk.gg / forum? s = ts3
After opening the link, the TS5 application starts. 
Can confirm this. I get the same with all three links from the help tab.
That’s a wanted behavior.
The domain is used for TS5 client in future and the old TS3 client has no updates yet to update the url to open the forum.
Take care of TS3, because this is the last so useful and minimalistic application. 
