How to change browser tab text?

When I open (view) my WebHelp project, the title is not correct. It is using an "old" title from a previous project that this one was created from. I changed the title on the Properties dialog box in the actual RoboHelp project, under Project Settings --> New Window --> Window Caption to the correct new text -- but this does not seem to affect the WebHelp browser tab title. (yes, I saved the project, regenerated web help, even tried shutting down RH then regenerating WebHelp again -- no effect).

I did not see a tab title option in the various property choices offered during WebHelp generation. Where is it getting this tab title from, and how can I change it?