Your experiences are the result of a wrong use of a browser.

To day you cannot use a browser without a script blocker and you have to think over the permission rules for this blocker. If you dont't use a script blocker, you are the victim of Google and all the other adservers. That's your own fault.

If you know the URL of a website use the address line of your browser or bookmark it. Never type it in the search bar of Google or in the input field of any other addon-tool. Only if you don't know the URL use Google to search for it. If in doubt highlight the URL you'll get by Google with your mouse and compare it with the real URL you can see in the left bottom of the browser. It's so easy to forge an URL within HTML.

I use Iceweasel/Firefox + NoScript and AdBlock+ and I've never seen Ebay or any other advert neither at knoppix.net/forum nor at knoppixforum.de.

Please read also th last part of Privacy Statment (right bottom ot this Forum).