It's possible that maybe your home page was accidentally changed. In that case, you can set it by following the [[How to set the home page]] document. However, the fact that it's some kind of support page may be an indication that your computer is infected with malware. It's not uncommon for certain types of malware to change your home page or open popups to illegitimate support websites in an attempt to scam you for a "technical support service". You may want to [[Troubleshoot Firefox issues caused by malware|scan your computer for malware]] to make sure that there's no issues with it. There are some free scanning applications listed [[Troubleshoot Firefox issues caused by malware|on the Mozilla support page]]. Hope this helps.