Rated 5 out of 5 stars

mokkin কর্তৃক জানু. 26, 2013 তারিখে ·

Works perfectly and very smooth for Firefox and Thunderbird in combination with SFLphone under Ubuntu Linux 12.10!
With SFLphone you need a little call script which can be found on their website.

This review is for a previous version of the add-on (1.3.3.1-signed).