libocannici writes "Abbeynet Labs has released the first version of a Firefox VoIP extension which is a full featured SIP user agent plugin for Firefox." The Firefox extension is completely stand-alone, with all VoIP functionality built directly into it. From one-click calling to SMS sending, this promises to be quite handy. All Internet calls are currently free, just requiring an abbyphone account, while PSTN calls have a small charge.
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