If you want to download videos from the web - which is evidently what Vgrabber is for - there's better behaved firefox addons to be found under Tools > Addons. Just search for'' Video downloaders:'' And of course make Vgrabber shut up, so it does not interfere anymore.

If problems continue try scanning with multiple up-to-date tools.

hi Sandpiper128, Likely to be malware so first of all try advice in this article *[[Remove a toolbar that has taken over your Firefox search or home page]] If problems continue try scanning with multiple up-to-date tools. ---------- You can try these free programs to scan for malware, which work with your existing antivirus software: * [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] [http://windows.microsoft.com/MSE Microsoft Security Essentials] is a good permanent antivirus for Windows 7/Vista/XP if you don't already have one. Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article. Did this fix your problems? Please report back to us!

Delete a possible user.js file and use the searchreset tool. * https://support.mozilla.org/en-US/kb/how-to-fix-preferences-wont-save#w_user-js-file-overriding-preferences * https://addons.mozilla.org/en-us/firefox/addon/searchreset/

Did you check the value of the browser.newtab.url pref on the <b>about:config</b> page? *http://kb.mozillazine.org/about:config If you do not keep changes after a restart or otherwise have problems with preferences, see: *http://kb.mozillazine.org/Preferences_not_saved