content: I am fairly confident that only blocking JavaScript will not help you with this type of tracking. Here's why: If a company (think as large as Google) can instruct all popular websites which it owns or has influence over - to serve a single pixel (a logo, background graphics, whatever) to all visitors and you log in to just one of these websites and later browse to another website while still using the same IP, you can be uniquely identified since these websites are working together (by simply putting their logs together). In fact, not even serving special pixels/identifying elements is required, all they need to do is put their logs together (which is standard practice if you are a large corporation which provides multiple services like email, video hosting, social networking etc). Some of the ways to try and improve your privacy while browsing the web is:  change your IP and browser agent every time you switch from a website and visit another website, never use the same IP twice block javascript, flash, java and only allow pure HTML block requests to download content from external domains if you browse only 1 domain never log in anywhere where your email or personal info is required, or, use guerilla mail or similar services  Basically, TOR should help you achieve very good privacy (not perfect), but using TOR will most likely make you more interesting for government agencies. In essence, the entire internet architecture as we know it needs to be revamped in such way that no device could be uniquely identified (dropping IP altogether, among other things).  The thing is, most hardware we use today is not open source, so you can very much count on that there are key-loggers/backdoors built into your motherboard, your router, your mobile phone, tablet any pretty much anything else which can connect to the internet.