Each time I do a google search in firefox, and click on any of the suggested sites, I get a large pop-up window with the address www.strtsrv.com, followed by a lot of "rubbish" numbers and letters. I've tried everything fomr blocking this site address in my firefox privacy settings, to going into my "about:config" and making alterations/additions on the "privacy.popups" section as suggested by various help sites, but to no avail. I have checked my firefox and ad-ons and found nothing suspicious there. Am at a loss. The only progress I have made is when the pop-up does appear, I have managed to get firefox not to open the content in the pop-up window, but the empty widow still appears which I then have to remove with a delete click.
Re: how can I remove the ad pop up www.strtsrv.com
Try Firefox Safe Mode to see if the problem goes away. Safe Mode is a troubleshooting mode, which disables most add-ons.
(If you're not using it, switch to the Default theme.)
On Windows you can open Firefox 4.0+ in Safe Mode by holding the Shift key when you open the Firefox desktop or Start menu shortcut.
On Mac you can open Firefox 4.0+ in Safe Mode by holding the option key while starting Firefox.
On Linux you can open Firefox 4.0+ in Safe Mode by quitting Firefox and then going to your Terminal and running: firefox -safe-mode (you may need to specify the Firefox installation path e.g. /usr/lib/firefox)
Or open the Help menu and click on the Restart with Add-ons Disabled... menu item while Firefox is running.
Once you get the pop-up, just select "'Start in Safe Mode"