Songbird is an AMAZING program I love it.

I love this program, too. There are great features, such as the combination of the great Mozilla Browser with a media player.
Some time ago I used Real Player, but I didn't like the IE which is integrated into it.
What I want to know is, what platform the Browser is based on, because the answering by IP is that it's a Mozilla 1.9 Browser, not Firefox.
Are all updates (Security issues) intergrated that are published by Mozilla for Firefox?
Thank you.