Thanks to DJ:
This tutorial is show you how to download Yahoo Go from your pc using firefox 3 it may work using older firefox, i'am downloading Yahoo Go for my Nokia 6120 Classic. Ok lets begin this tutorial.

1. Run your firefox
2. At the address bar, type: about:config
3. Click "I'll be carefull, I Promise!" button
4. Right click at any area and select "New" -> "String"
5. Type "general.useragent.override" and click "OK"
6. Type"Mozilla/5.0 (SymbianOS/9.2; U; Series60/3.1 Nokia6120c/3.83; Profile/MIDP-2.0 Configuration/CLDC-1.1 ) AppleWebKit/413 (KHTML, like Gecko) Safari/413" and click "OK"
7. At the firefox address bar type "m.yahoo.com"
8. Click "Upgrade to yahoo go!" link
9. Now you may download: "Yahoo! Go 3.0 Beta"

or "Yahoo! Go 2.0"
10. Save "YahooGo.jad" file to your disk...
LINK:

[Only registered and activated users can see links]