Working great using the 5.2.3 version on both Basilisk 2018.02.02 and Pale Moon 27.7.2
I would like to give extra thanks to the developer (Dave G) for keeping the DB files the same between the Web Ext version and the XUL version.
I was able to use the Web Ext 6.0.1 files to keep my XUL 5.2.3 version updated.
Thank you for this addon.

REALLY AMAZING TOOL! USEFUL FOR WEBMASTERS

great addon I've used it for years
too bad Firefox ESR and Pale Moon/Basilisk aren't supported in the 6.x branch
can we get an IP database update for the 5.x branch that still uses xpcom not webext

I like to know what country the website is hosted in. This helps with that info.

Have always used this extension before Firefox was updated. Now it works fine with Firefox 58. i am very pleased as it is nice to know where certain sites are!

Good

Estupendo trabajo.

Obrigado!

es una herramiente muy instructiva y nos ayuda de identificar de donde provienen las informaciones

Any chance of adding a Websites Popularity Rating option?

So glad to see Flag-fox available for versions 57+. (I am using Nightly versions 59+). This add-on was the one I missed the most. Thank you Dave G. for your effort and time to convert the add-on from older version. This add-on is a must. It is very convenient to know were the servers of a site are located before you do business with them. Also, the "Is it up?" option lets you know if the a site you are trying to access is down on their end or if you have a problem on your end. I recommend this add-on to all Firefox users.

it is one of the best add-ons! thanks for firefox 57 support !!

Excellent recreation of this useful extension

The little flag in the location bar is useful for people who care to know how the Internet works, and actually something that other people have occasionally noticed while looking at my Firefox windows.

P. S. Thanks for porting to WebExtensions! I made a donation after the fact.