I got it resolved this issue for my need.
I wanted to open a headless browser and grab a string on the page.
I used “use applicaiton/browser” activity. In the properties, I set the option browser webdriver mode to headless.
Then I launched the website and indicated the website to the “use app/brow” activity.
Then I used the gettext activity and capture the elements of my string.
all the while no webpage was launched