Hello (:

EDIT v1.0 RELEASED:

Written in Python now, but bash is used sometimes
The updater can be downloaded in my google code page
Early versions can be downloaded in the same page
Supports 24 languages
Just install option is still available

Usage:
Code:
python firefox-updater.py --Arabic
python firefox-updater.py --Just-install
python firefox-updater.py --list
Source code available here


The script was based on Qu4R0w's thread "Install Firefox 3.6.9 on BT4"

Notes:
The file is from a Mozilla's mirrors;
When you first run it, use the shortcut in: K Menu->Internet->Web Browser;
In the first time you run Firefox 4.0 it will ask to verify the add-ons, do it or they won't work;
If they still don't work, go to "add-ons" menu and verify'em manually;
I didn't changed the file than will be downloaded in any way;
SQL Injection! isn't working (yet);
If you need SQL Injection! type:
Code:
killall firefox-bin
And use the shortcut next to "Desktop Access", it will load Firefox's old version;
Verify the add-ons again to make'em work;
Firefox will be downloaded in English;
If you don't believe than the file will be downloaded from Mozilla's mirrors, please comment the wget command, download the file and use the script, firefox "should" work normally.
Congratulations if you readed all the notes (:
All the files will be downloaded from the servers listed in http://www.mozilla.com/en-US/firefox/all.html

Enjoy.

Changelog
v0.0
-Wget file (only)
vo.1
-Fixed FTP server
v0.2
-Users can now interact with the script, and choose the app's language.
v1.0
-Written in python
-Supṕorts more languages
-User interaction disabled