You probably have malware.

https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware

I see that you previously posted in an earlier thread at https://support.mozilla.org/en-US/questions/933520 (started by another user) and now you have started your own thread.

Have you tried all of the suggestions given in the Remove a toolbar that has taken over your Firefox search or home page article?

If so, then you may have a malware infection that you will need help removing, by visiting a forum specializing in malware removal. See Troubleshoot Firefox issues caused by malware.

Yes, I've tried all of the suggestions given earlier. Sadly, it have done nothing.

I will check this link about the malware, I can already see some suggestions there that may help me.

Thank you

Try to create a new profile as a test to check if your current profile is causing the problems.

See "Basic Troubleshooting: Make a new profile":

• https://support.mozilla.org/kb/Basic+Troubleshooting#w_8-make-a-new-profile

There may be extensions and plugins installed by default in a new profile, so check that in "Tools > Add-ons > Extensions & Plugins" in case there are still problems.

If the new profile works then you can transfer some files from the old profile to that new profile, but be careful not to copy corrupted files.

See:

• http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

Do a malware check with some malware scanning programs on the Windows computer.
You need to scan with all programs because each program detects different malware.
Make sure that you update each program to get the latest version of their databases before doing a scan.

• http://www.malwarebytes.org/mbam.php - Malwarebytes' Anti-Malware
• http://www.superantispyware.com/ - SuperAntispyware
• http://www.microsoft.com/security/scanner/en-us/default.aspx - Microsoft Safety Scanner
• http://www.microsoft.com/windows/products/winfamily/defender/default.mspx - Windows Defender: Home Page
• http://www.safer-networking.org/en/index.html - Spybot Search & Destroy

You can also do a check for a rootkit infection with TDSSKiller.

• http://support.kaspersky.com/viruses/solutions?qid=208280684

See also:

• "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked

Thank you, I will try to see with a new profile and will check with all the softwares above.