I think this is the most innovative Firefox extension so far ! Zoep is a firefox extension which aims to provide a Integrated VOIP Phone and Instant Messenger for Firefox users. The extension is currently for Windows only and requires Firefox version 1.5 but hope that more plateforms will be supported very soon.
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When installed you will see Zoep has a single button on the browser toolbar positioned just in front of the web address text box. The button opens a window in the same way as bookmarks or tools>options does.
PC to PC calls are free and like other popular services there is a pre-pay PC to Phone option. Zoep can communicate with other open Jabber based services like Google Talk for Instant Messaging.
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Future plans include SMS, Voicemail and incoming phone number to receive phone calls from phone networks (with the incoming caller paying the call charges)
The current version is beta 0.8, I have register an account hatem, so you can add me and give it a try when i’m online.