so good, so bad Rated 4 out of 5 stars

A very excellent add-on, but have a very bad issue too. When a URL is not presented on its domain, the FireFox will be locked completely for many seconds!. It is a really bad issue, so bad that after many years using of this add-on, I'm searching for a replace for it.

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

Please post bug reports to code.google.com/p/firefox-showip/ -- I'll gladly help you to resolve the issue. As you are the first one reporting it, it might very well be a interaction with other addons you have installed.