After delete plugin

What plugin?

found firefox.bak folder

What folder is that, and what's the entire path to that folder?

Please provide more information. For now I can't see how a plugin is related to your bookmarks.

You can check for problems with the places.sqlite database file in the Firefox profile folder.

• http://kb.mozillazine.org/Bookmarks_history_and_toolbar_buttons_not_working_-_Firefox
• https://support.mozilla.org/kb/Bookmarks+not+saved#w_fix-the-bookmarks-file

• Places Maintenance https://addons.mozilla.org/firefox/addon/places-maintenance/

You can also check if you have created a new profile by accident.

• https://support.mozilla.org/kb/Recovering+important+data+from+an+old+profile

• http://kb.mozillazine.org/Lost_bookmarks
• https://support.mozilla.org/kb/Lost+Bookmarks

google search hijacked by yahoo (DNS solution yahoo error http://us.yhs4.search.yahoo.com/yhs/errorh so I used avast browser delete all related dangerous plugin after I cleaned virus, all my favorite dispeared

I used EASEUS Data Recovery Wizard Professional recovered a folder called Mozilla Firefox.bak I tried cor-el solution but all profile files gone already

This doesn't make any sense to me. You'd need to provide a little more detailed information.

Please tell us concisely:

• What you did
• What happened
• What you expected

My firefox browser was infected by virus "google search hijacked by yahoo (DNS solution yahoo error http://us.yhs4.search.yahoo.com/yhs/errorh" I used spybot destroy to clean all virus but cant delete all,

so I used "avast browser cleaner" delete all related dangerous plugin after I cleaned virus, all my favorite dispeared

I looked into profile, all files is gone. After I opened firefox again, profiles files has recreated automaticly. I old profiles favorite files still can not see it.

I used EASEUS Data Recovery Wizard Professional to scan for delete files. I have recovered a folder called Mozilla Firefox.bak and some other stuffs but can not find old places.sqlite

So what I can do now? Please help!!!!!!

Thanks!

Thanks. Just to get the terminology right, neither Spybot Search & Destroy nor Avast Browser Cleanup are supposed to clean viruses. This is what anti-virus software is for.

Avast Browser Cleanup is a tool that serves to delete unwanted toolbars and plug-ins. None of these are viruses.

I haven't heard about Avast Browser Cleanup before, and it's certainly not something I'd have used. In any case, it's not supposed to kill your profile.

I have recovered a folder called Mozilla Firefox.bak and some other stuffs

So what's in that recovered folder? If it contains the automatically created backups of your bookmarks, you can recover your bookmarks from that. https://support.mozilla.org/en-US/kb/restore-bookmarks-from-backup-or-move-them

avast! Free Antivirus and anti-spyware protection for Windows 8, 7, Vista, and XP Spybot +AV: The all-in-one antispyware and antivirus software solution

Antivirus programs are not only Norton, Mcafee and other paid programs. There are many other free programs. I do not work or associate with avast or spybot in anyway. Thanks for trying, but I know all this official basic information already. I tried your links already. I used 8088,8086,80236,----PII,I5, I7 and old mac all kind of computers

I tried your links already.

What did you do and what happened?