As far as I remember from my Mac, the Wi-Fi signal icon is there always, whether I am running Firefox or not. Are you sure, the problem is Firefox-related?

PS: could be, that it's a USB device, and it's been removed inadvertently...

Thanks for your r eply - it may not be Firefox related, but where to start?!

Thanks for your r eply - it may not be Firefox related, but where to start?!

Hello, go to /System/Library/CoreServices/Menu Extras/ and enable the AirPort.menu

see : http://www.maclife.com/article/howtos/how_use_secrets_os_x_menu_bar

thank you

THANKS FOR YOUR SOLUTION.......WHAT DO YOU MEAN BY LIBRARY?

Hi, see the next link, http://guides.macrumors.com/Library

thanks