This action will open a browser window to fill the screen, or to a specific size. To do this, apply the Fit Page to Screen action from the Page > Action menu to the page you want to adjust.

Fit to Screen - If you want the browser to display at its full size.

Uncheck Fit to Screen for opening the browser window at a specific size.

Width - The width of the browser window.

Height - The height of the browser window.

X Position - The horizontal offset of the browser.

Y Position - The vertical offset of the browser.