This library includes Flash detection based on code from the "flashdetect" library, which is in turn based on a simplified version of SWFObject.
This library is newly released. It has only been tested on whatismybrowser.com. Using this library on your website may have unintended consequences for you. We want to ensure that this library is as non-intrusive as possible, so if you find any problems with it, please let us know and we will do our best to fix it.
Adblock detection involves modifying your webpage's Document Object Model (it inserts a div with an id designed to cause adblocking software to hide it).
In order to check if a user has allowed third party cookies, it's necessary to actually set a third-party cookie (and then check it's existence a few seconds later). To do this, the code will make two requests to one of our special domains: webbrowsertests.com which is specially configured to set and then check a cookie.
When these requests are made, the library will also include the full url of the page that is making the requests (unless your site sends HTTP headers which stops this), as well as the version number of the Frontend Library. Naturally these HTTP requests will also include the IP address of the client making the request and their user agent. This information will be stored. We use this information for diagnosing problems, monitoring and reporting as well as stopping malicious or abusive use. We don't use it for any advertising or tracking purposes and (other than aggregate data) the logs are rotated every few weeks.
You'll probably need to update your Privacy Agreement/Terms & Conditions on your website to note these requests.