Rated 4 out of 5 stars

This is a great extension. The information available at one's fingertips makes this extension a must have for any serious web user.

I have one bone to pick, though. I've noticed that the country name for websites located in Iran is listed as "Islamic Republic of Iran".

Why not do the same with the UK or China? After all, the UK is formally known as the United Kingdom of Great Britain and Northern Ireland, and China is formally known as the People's Republic of China. Similarly, shouldn't "Belgium" be "Kingdom of Belgium"?

PS: One extension states that the website Mondoweiss.net is located in Canada, while WorldIP states that it's located in the US. I'm not sure which source is more reliable.

This review is for a previous version of the add-on (2.0.1). 

1) Regarding country names you can see ISO 3166 standard
http://en.wikipedia.org/wiki/ISO_3166-1_alpha-2
2) Mondoweiss.net is in Dallas. You can use our tools worldwide pings & traceroute to check it.
Oh, and thanks for good mark..