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The "Startup URL" parameter contains the URL that the browser should launch at startup. It will preempt any setting in the Connection target parameter; that means, if both the Connection/Connection target parameter and the Firefox-Browser/Startup URL parameters are set, the Startup URL parameter will win.
The "Start page" parameter can override the behavior and display a blank page, even if a startup URL is already set. By default, a blank page will be shown only when both the Startup URL and the Connection target are empty.
=== Screen layout and toolbars ===
By default, Firefox will be run maximized - Maximized means that there is still the task bar taskbar visible as well as the window title bar. Other options would be "fullscreen" - without window title bar, without window borders, and covering all screen including the task bar taskbar with its start menu; or "X/Y size", meaning run in a window of size X pixels horizontally and Y pixels vertically. If you select "X/Y size", you should enter your desired Window height and width into the appropriate parameters. With the Window size "Maximized" or "Fullscreen", both options "Window width (X)" and "Window height (Y)" have no effect (of course).
Three separate options allow you to control the appearance of the tab bar, navigation bar , and menu bar.
=== Content options ===
There are parameters to specify the accepted languages - a comma-separated list in standard locale formatformats, such as en or en_US for English or English/USA. The order matters! So for example , if you would prefer to see Web pages in Italian, but speak English as well, you could enter it,en. French Canadians might want to enter fr_CA,en_CA,en_US to have French set as desired language with fallback English (Canada) and then English (US).
Furthermore , you can block automatic loading of images, pop-up windows , and Javascript.
=== Parameter lock ===