Hi George, welcome to the forums.
The simplest option would be to 'reset' your browser settings (you can do this with the browser open)
I only have IE so can only help with that
Click Tools -> Internet Options then the 'Advanced' tab. Next, click 'Restore advanced settings...' and see if that helps
You will need to restart IE
If that does not work, then try the 'Reset...' option.
After the 'Reset...' you will need to re-install any addons you had previously
Hope this helps