Where is Firfox update setup file?

[g_goyal2000]

Hi.
I recently updated my Firefox v2.0.0.3 to v2.0.0.4 using Firefox's inbuilt update feature.
Since it downloads the entire setup file, I wanted to know where can I find this file on my disk.
Thanks.

[slugger]

i doubt dat it download files like in an installer, me think dat wat it does iz dat it download d updated files [*.dll, *.properties etc etc] and directs them to their desired location, overwriting the existin' file [if any]

[g_goyal2000]

Maybe. But then where does it download these updates files too?