http://googleads.g.doubleclick.net and doublclick
googleads.g.doubleclick.net and doublclick are hijaking your browser! They are not virus's but they slow down your internet browsing and cause your internet browser back button to stop working!
Backbutton Not Working on Your Browser
Your Browser back button is working but it seems like it isn't. This is because your browsing history is showing ad sites that you didn't visit. If you find that your back button does not take you to the page you expected it to then you will probably be suffering from the googleads.g.doubleclick.net and doublclick issue.
googleads.g.doubleclick.net and doublclick Hijacks Your Browser History!
When you encounter this problem, hover over the browser back button and click the right button on your mouse. If you see googleads.g.doubleclick.net in your browsing list then you have been hijacked!
Remove http://googleads.g.doubleclick.net and doublclick
You will not be able to remove these little bits of software but you can fix your browser so that your internet browsing is speeded up and your backbutton works correctly again. To find out how please click on the button 'Show Me How To Stop googleads.g.doubleclick.net and doublclick Hijaking My Browser'