That's definitely not normal. Could you go through the following article, and pay special attention to the user.js section, since your "More System Details" shows there is a user.js file in your settings folder:* [[How to fix preferences that won't save]] Also, there are some utility/security programs that will undo your browser settings changes between sessions. One of these is Advanced SystemCare, and there are others with similar browser protection/home page protection features with this annoying behavior. ---- Separately, do you notice an Old Firefox Data folder on your desktop? This folder is created when the Refresh feature runs. If it is filling up with semi-randomly-named settings folder, your Firefox may (for unknown reasons) be resetting itself over and over. ''* Note: By default, Windows hides the .js extension. To ensure that you find the user.js file, you may want to turn off that feature. This article has the steps:'' http://windows.microsoft.com/en-us/windows/show-hide-file-name-extensions