To the person who replied, it was a mistake adding H A C K E R word into the title. Please reply here.

This sounds like a very odd issue, especially since you weren't able to open your previous thread, even though the word that you have referenced as the issue is not included in the URL. This is likely just a piece of malware that is installed on your computer. If you are concerned about the security of your system, you should scan for infections on your system. You can try these free programs to scan for malware, which work with your existing antivirus software: * [https://www.microsoft.com/en-us/wdsi/products/scanner Microsoft Safety Scanner] * [http://www.malwarebytes.org/products/malwarebytes_free/ MalwareBytes' Anti-Malware] * [http://support.kaspersky.com/viruses/disinfection/5350 Anti-Rootkit Utility - TDSSKiller] (for more info, see this [https://www.bleepingcomputer.com/download/tdsskiller/ alternate TDSSKiller download page]) * [https://www.malwarebytes.com/adwcleaner/ AdwCleaner] (for more info, see this [http://www.bleepingcomputer.com/download/adwcleaner/ alternate AdwCleaner download page]) * [http://www.surfright.nl/en/hitmanpro/ Hitman Pro] * [http://www.eset.com/us/online-scanner/ ESET Online Scanner] [https://support.microsoft.com/help/14210/security-essentials-download Microsoft Security Essentials] is a good permanent antivirus for Windows 7/Vista if you don't already have one. Windows 8/10 have antivirus protection [https://www.microsoft.com/windows/windows-defender built-in]. Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article. If you are concerned that the attacker may have gained access to your router, there are also other security things that you should try, such as resetting your router and changing the SSID and password. You should also [https://www.whatsmydns.net/flush-dns.html flush your DNS] to protect against any DNS cache poisoning that may have occurred. Hope this helps.