[orca-list] does some one know the mozila repository for Ubuntu?

[hackingKK <hackingkk gmail com>]

    hello all.
Don't take this as off topic although it sounds like that.
Actually I want to try out the stoc build version of firefox from mozila 
instead of the one packed with Ubuntu, just to make sure all is well.
I would also like to try out their build of thunderbird so it is more 
important.
Can some one give me the repository for mozila which I can add to my 
sources.list?

Happy hacking.
Krishnakant.