Tab Kit compatibility Rated 3 out of 5 stars
I prefer to have Tab Kit open a new tab to the right of (or below) the current tab or group, which is a setting in the Tab Kit options.
New Tab Homepage overrides the Tab Kit option, and opens all new tabs at the far right (or bottom) of the tab bar.
I am keeping NTH disabled until or unless this problem is resolved.
Apologies for the anonymity.