Every time I open a new tab it opens to Vgrabber, I would like it to open to a blank tab preferably.
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.
Likely to be malware so first of all try advice in this article
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:
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.
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Delete a possible user.js file and use the searchreset tool.
Did you check the value of the browser.newtab.url pref on the about:config page?
If you do not keep changes after a restart or otherwise have problems with preferences, see: