Try booting into windows safe mode. http://kb.eset.com/esetkb/index?page=content&id=SOLN2268&locale=en_US

Does it show now.

all my book makes are in google chroni

all my book makes are in google chrome

You can also import bookmarks from chrome if you'd like, also does this page show on other browsers such as Internet Explorer, Google Chrome etc.

• Import bookmarks and other data from Google Chrome

prefs.js,user.js are two file I need to delete but I do not know how

That is not a problem I have all my bookmarks saved I just need to know how to remove these things prefs.js,user.js are two file I need to delete but I do not know how

Then what what after I boot in safe mode

What happens if you go to the Firefox profile folder and try to delete those files?

Note that Windows hides some file extensions by default.
Among them are .html and .ini and .js and .txt, so you may only see a name without file extension.
You can see the real file type if you open the Properties via the right-click context menu

• C:\Users\<user>\AppData\Roaming\Mozilla\Firefox\Profiles\<profile>\

• http://kb.mozillazine.org/Show_hidden_files_and_folders

Unhide file extenstions as cor-el said then right click the user.js and prefs.js and delete them.

it would not let me delete or right click

no did not

The site is malware.

• https://www.mywot.com/en/scorecard/savetubevideo.com

scan with

• Microsoft Safety Scanner
• MalwareBytes' Anti-Malware
• TDSSKiller - AntiRootkit Utility
• Hitman Pro
• ESET Online Scanner

in windows safe mode

I have window 7 most of the links they are in XP

I can't stress this enough, this is MALWARE. Scan with the tools I linked above in Windows Safe Mode.

• http://www.bleepingcomputer.com/forums/t/376940/im-infected-with-the-savetubevideo-virus-please-help/

no it did not

they can not find it on my pc when I scan

Try a scan with AVG Rescue DIsk.

• http://www.avg.com/us-en/226386

I was able to open registry editor still can find pref js user js

No, using another computer, burn AVG Rescue disk iso to a CD and run it as explained.