This article describes how to investigate some possible reasons that your home page change might get lost and be back to the unwanted page at the next Firefox startup, including: * Firefox preferences file not being updated (sometimes due to a file lock) * Malware created a user.js file which Firefox reads at startup and uses to override your previous session settings * External software is "protecting" you from unwanted settings changes by locking in old settings (Advanced SystemCare, and others) Here's the article: [[How to fix preferences that won't save]] Of course, a live malware infection also can wreak havoc on your Firefox settings, so if you haven't already, please: (1) Open the Windows '''Control Panel''', Uninstall a Program. After the list loads, click the "Installed on" column heading to group the infections, I mean, additions, by date. This can help surface additional bundle items you might have missed. Take out as much trash as possible here. (If in doubt, feel free to post a screenshot.) (2) You can search for remaining issues with the '''scanning/cleaning tools''' listed in our support article: [[Troubleshoot Firefox issues caused by malware]]. These on-demand scanners are free and take considerable time to run. If they finish quickly and especially if they require payment, you may have a serious infection. I suggest the specialized forums listed in the article in that case.