OK it's not in there
So lets try this
At the top of the Firefox window, click on the Firefox button (Tools menu in Windows XP) and then click Options On the menu bar,
click on the Firefox menu and select Preferences...
At the top of the Firefox window, click on the Edit menu and select Preferences
At the top of the Firefox window, click on the Tools menu and select Options...
On the menu bar, click on the Firefox menu and select Preferences...
At the top of the Firefox window, click on the Edit menu and select Preferences...
Select the General panel.
In the Home Page text box, replace all pipes (|) with %7C
Click OK to close the Options window
Click Close to close the Preferences window
Close the Preferences window