Running the Firefox 3 beta

[Marcus Better]

Hello again,
>> this may be a silly question, but I'm trying to launch Firefox 3 beta 2
>> (binary downloaded from Mozilla), but it just launches Debian's iceweasel
>> instead.

> we have a recent firefox-3.0 in hardy and the beta2 for gutsy in the
> mozillateam ppa.

Now I really need to run a Firefox nightly binary downloaded from
mozilla.org. How to I do that instead of launching Iceweasel?

Cheers,

Marcus