Disable splash screen
From MozillaZine Knowledge Base
You don't want the splash screen? heres how you disable it.
- Right click the icon you use to launch Mozilla, click on Properties.
- On the Shortcut tab, add "-nosplash" to the end of whatever is in the Target field (e.g. "C:\Program Files\mozilla.org\Mozilla\mozilla.exe" -nosplash).
Next time you use that shortcut to launch Mozilla, there will be no splash screen.