I watched the link Bogs provided,
As a Firefox user, I downloaded collusion and left everything alone for a day.
Next I tried to get Tor browser to link up with Firefox but the Add-0n has been removed from Firefox. Tor is effective but browsing is very slow, (akin to normal dial-up), who knows how slow it would be if only dial-up was available.
I have now:
1. Changed my privacy settings to not accept 3rd party cookies. NB, I thought I had this already but it would appear that every update to Firefox reverts to the defaults?
2. I Ticked the box, tools options privacy "tell websites I do not want to be tracked." From what I've read, this is a bit meaningless as it appears we have another one of those voluntary code of practice issues.
3. I installed and activated the Add-On - "Adblock Plus."
4. I then reset the graph in Collusion and so far the collusion page is blank.
Here's hoping.
Sorry, I don't know about other web browsers.
Best Regards
Bob