Upload & Sell: Off
I use a bunch of different browsers on various Windows OS's:
Never noticed the issue on Firefox.
Used to see it on Chrome, but haven't noticed it lately.
Always see it on IE8.
On IE8, I usually see one or more "google ad services" pages in my browser history after I hit "back".
These pages don't appear in my history when I use Firefox or Chrome.
Usually I hit the "back" button on my mouse an extra time, and it works OK.
But sometimes, "back" doesn't work at all, and the page history in IE8 is really messed up.
The last time I saw this, my entire browsing history menu was filled with many references to the same "doubleclick" ad page.
I've seen the same problem on the "POTN" forum with IE8, but don't remember seeing it on any other sites.