How to remove the url which automatically navigates to unwanted site from firefox tab

Hi
If you have installed some unwanted toolbars in the firefox and you have installed it.
Still the site appears while you open a new tab.
you don't know how to remove it.
Here is the solution for the Firefox

• Open a new tab
• Type 'about:config' into the address bar 
• Accept the warning
• Search for 'browser.newtab.url'
• Right click and choose reset
• The value should change to 'about:blank' 

 I will search for IE and let you know in another post