Would you mind If I see what kind of website you mostly visit ? What kind advertisements you click ? etc
You sure don’t. No one likes that. Many people want to browse the web anonymously using a proxy server even. Because everyone has their privacy. If you remember I wrote another article on How to browse the internet privately Yes this similar to that.
Mozilla Firefox 4 started to send your online behavior data. This feature is called “Do not block”. They introduced this feature in 2011 but majority of people are still not aware of this. It comes by default.
Therefore it keeps sending your data until you change it.
But why do they do it ? Those data help advertisers to put advertisements on websites. Because they can know what kind of websites you mostly visit and what kind of advertisements you click. etc
To stop that simply go to Tools —> Options
And mark on “Tell websites I do not want to be tracked”.