You should restore your Mozilla Firefox browser to default settings in order to get rid of browser redirects, pop up ads, fake error alerts and other malware. All of your stored bookmarks and passwords will stay safe.
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Launch Mozilla Firefox browser. Click Menu 
icon in the upper-right corner of the page. Next, click Help Menu 
icon below.
From the Help Menu list, select Troubleshooting Information option. You may also type about:support in Mozilla Firefox address bar to bring up Troubleshooting Information page.
Click Refresh Firefox… button in the dialog window.
Click Refresh Firefox button in the confirmation window.
