Are you using Chrome or Edge/IE? If Chrome, check in the settings if the ‘Browser to use’ setting is set to ‘Chrome Native’ (not ‘Chrome Selenium’) and that you installed the extension to the right Chrome user. Also, check that the ‘Chrome Native’ setting is applied for the project settings (not only the setting of the Studio Pro).
When ‘Chrome Selenium’ is used, the Studio Pro will always open a separate instance of a browser while with the ‘Chrome Native’ it can continue using the browser copy opened by a user.