1. Drag the sides of the browser window to the edges of the screen then go the File menu, select Close and press F5. Click the link again and the new window should open fully.
2. Maximise the window using your mouse, then hold down the Ctrl button, close the window, let the Ctrl button go and re-open the window.
3. Hold down Ctrl + Shift + Alt while using the mouse to drag the sides of the window to fill the screen, close the window while still pressing the buttons.