Rated 1 out of 5 stars

Huge privacy leak
http://nakedsecurity.sophos.com/2012/05/01/privacy-concern-showip-firefox-add-on/

This review is for a previous version of the add-on (1.0.1-signed.1-signed). 

update

hi and thanks for your info.
In order to show data like provider, country, city the plugin needs to get this data from api since it is not available within the browser itself. We are adding https asap, in the meantime you can either use an older version (published here) or deactivate the infos in the settings..