LocalStorage
What is StatCounter & LocalStorage?
The site you were visiting is using StatCounter (us!), an independent web analytics firm, to count and analyse visitors to their site.
When you first visited the website, StatCounter stored a small amount of information on your computer, in localStorage, so that the next time you return to the site, we can recognize that you have already visited the site and won't count you as a new visitor.
Why LocalStorage?
LocalStorage is being used instead of a cookie ("1st party cookie") as cookies get sent in the HTTP header of each web request, and we don't want to clog the web connection on the website you are visiting.
In your browser it should be possible to clear localStorage in the same way that you clear your cookies — we are not trying to circumvent this aspect of browser privacy, so please let us know if clearing localStorage is difficult in the browser you are using.
SessionStorage
StatCounter also temporarily uses SessionStorage to queue up tracking hits that have been missed due to network connectivity issues etc. These are not kept after you close the browser window.