Firefox can prefetch websites that are linked on the site that you currently look at. If you don't want that, then you can open


in your browser and search for


and turn it to false.

If your firefox is closed, you can add the line

user_pref("network.prefetch-next", false);

to $firefox-profile/prefs.js or $firefox-profile/user.js insteed.

Another feature that you might want to block is sending the referer. If you click on a link on website that referes to website with the referer feature enabled, then website will know that you last visited website If you don't like that you can turn the option


to 0 in about:config or change the option in prefs.js or user.js accordingly.