'''Scan for Malware''' Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of. You can try some of the following programs to scan for malware: * [http://www.malwarebytes.org/mbam.php MalwareBytes' Anti-Malware] * [http://support.kaspersky.com/faq/?qid=208283363 TDSSKiller - AntiRootkit Utility] * [http://windows.microsoft.com/MSE Microsoft Security Essentials] (A good permanent anti-virus if you don't already have one) Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article. '''Reset Firefox''' The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information. Note: ''This will cause you to lose any Extensions, Open websites, and some Preferences.'' To Reset Firefox do the following: #Go to Firefox > Help > Troubleshooting Information. #Click the "Reset Firefox" button. #Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish. #Firefox will open with all factory defaults applied. Further information can be found in the [[Reset Firefox – easily fix most problems]] article. Did this fix your problems? Please report back to us!

Now it dissapeared. What if I see like addons changes their location and if one addon is seen - another one is not?

You may be seeing the Social features toolbar button or sidebar. You can disable the Social features by setting the <b>social.enabled</b> pref to false on the <b>about:config</b> page. *http://blog.mozilla.org/futurereleases/2012/07/06/bringing-social-to-firefox/ *http://blog.mozilla.org/labs/2012/03/experimenting-with-social-features-in-firefox/