In QtCreator "Help" tab, open any documentation of an addon module (I only tested qtapplicationmanager and qtinterfaceframework) and click on a link to a core module documentation. The link will refer to an http resource and open in a browser instead of staying inside the QtCreator Help tab. This is pretty annoying to say the least.

For instance search the index for WindowManager (this needs the qtapplicationmanager documentation to be available), open the corresponding page and click on "QAbstractListModel" in the second line of "Detailed Description".