Check for malware, remove a possible user.js file, and use the searchreset tool, its essential that you peform ALL of these instructions below. 1. Malware CHECK WITH ALL PROGRAMS * [http://www.microsoft.com/security/scanner/default.aspx Microsoft Safety Scanner] * [http://www.malwarebytes.org/products/malwarebytes_free/ MalwareBytes' Anti-Malware] * [http://support.kaspersky.com/faq/?qid=208283363 TDSSKiller - AntiRootkit Utility] * [http://www.surfright.nl/en/hitmanpro/ Hitman Pro] * [http://www.eset.com/us/online-scanner/ ESET Online Scanner] Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article. 2. User.js See the [[How to fix preferences that won't save]] on deleting the user.js file. 3. Use the search reset tool addon (uninstalls after doing its miracle work) https://addons.mozilla.org/en-US/firefox/addon/searchreset/

See also: *[[/questions/944832]] *http://deletemalware.blogspot.com/2013/01/remove-snap-do.html