Afraid I'm now having issues with this mod too.
If I create 1 new tab - everything works fine.
If I then create another new tab to function as a menu - things still work ok.
BUT! If I create a second tab, internally linked, then the 1st tab works fine but when I click the second tab the first additional tab stays highlighted. I've tried all different means of THIS_SCRIPT, URL, URL_PARAMETER etc - just cannot get it to function correctly.
Still have it installed, but it means that if I need to add more tabs in future I may have to uninstall and go with a different mod unless this one gets updated to address the issue