Utter paranoid rubbish. Why would anyone be even remotely interested in what is on your computer? Your info on your computer may be important to you bu, like mine, it is utter drivel to anyone else. Your web browsing is already monitored and stored by your ISP even if you use 'anonymous' browsers and even if you do not accept cookies. The web is an open, free resource so all your meanderings are recorded and if you do not like it or you think that you are so important that companies need to know all about you...do not use the Internet.
Just forget about it, use the net to further your knowledge and get on with the important things in life.