Where does your IP locates you?

See http://whatismyipaddress.com/

my IP locates me in southern France, where I live.

Are you close to the Italian border? In which language is your Firefox? Can you provide the URLs so that I test them?

Clear the cache and the cookies from sites that cause problems.

• "Clear the Cache": Firefox > Preferences > Advanced > Network > Offline Storage (Cache): "Clear Now"
• "Remove the Cookies" from sites causing problems: Firefox > Preferences > Privacy > Cookies: "Show Cookies"

If the Google (Firefox) or Yahoo home page is in the wrong language then see:

• Google: http://www.google.com/support/bin/answer.py?answer=873
• Yahoo!: http://help.yahoo.com/l/us/yahoo/homepage/homepage/basics/troubleshoot-02.html