This is the delay after which the window that the mouse pointer is over will automatically come to the front.
When this option is enabled, a window in the background will automatically come to the front when the mouse pointer has been over it for some time.
Reload the currently displayed document This may, for example, be needed to refresh web pages that have been modified since they were loaded, in order to make the changes visible. Any images on the page are downloaded again, even if cached copies exist.
You have hidden the navigation panel configuration button. To make it visible again, click the right mouse button on any of the navigation panel buttons and select "Show Configuration Button".