Adds a splash screen to most Mozilla and Mozilla Based products. Supports sound, opacity, CSS customization, custom images, and much more. You can add {appVersion}, {buildID} and {userAgent} to the loading text and it will be filled in for you.
Works with Firefox 1.5 – 3.6a1pre
2.0.0.1 Release Notes:

• Updated: All translations have been updated and ja locale has been added.
• Fixed: Apostrophe’s in splash text were not exported/imported properly.