Option-Click AirPort Menu for Network Details
If you hold down the Option key while clicking the AirPort menu in Mac OS X 10.5 Leopard, you'll see not just the names of nearby Wi-Fi networks, but additional details about the selected network. Details include the MAC address of the network, the channel used by the base station, the signal strength (a negative number; the closer to zero it is, the stronger the signal), and the transmit rate in megabits per second showing actual network throughput. If you hover the cursor over the name of a network to which you're not connected, a little yellow pop-up shows the signal strength and type of encryption.
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Note that if you haven’t opened Firefox in awhile and allowed the automatic updates to be applied, you’ll have to go through multiple updates to get to Firefox 18 (our version needed to first jump from 16.0.1 to 17.0.1 and then to 18).
I'm not sure I've actually used Firefox other than to check a Website in about two years . . .
I use this a lot to search TidBITS, Amazon, and Google (since I have the omnibox set to do Google Browse By Name, per http://tidbits.com/article/12099 )
I shudder to think what will happen when Firefox reaches drinking age!