Below are instructions for resetting common browsers.
Click on Tools > Internet Options. Go to the Advanced tab. Click on the Reset button.
Close all running instance of Opera. Go to the installation folder of Opera:C:\Users\user_name\AppData\Roaming\Opera\Opera\, provided that you have installed Opera using the default settings. Delete the Operapref.ini file
On the latest version of Google Chrome, click on the Customize and control Google Chrome button > Settings.
Click on Advanced Settings.
Scroll down to the bottom of the page, until you reached the "Reset browser settings" section.
Click on Reset browser settings.
Click on the "Safari" in your Safari menu.
A drop-down menu will appear, simply click on the Reset Safari tab.
A warning dialog will appear pointing out what will be removed.
Click on the Reset button to complete the process.