Are these the settings in: orange Firefox button (or Tools menu) > Options > Content I believe those are saved in prefs.js, a file that could be modified or overridden by other software. Some things to consider: * [[How to fix preferences that won't save]] * If you use Advanced SystemCare, turn off the "Surfing Protection" feature in order to save changes If you are losing site-specific settings such as increased or decreased zoom levels, I think these might be part of the category "Site Preferences". If you have Firefox set to clear history at shutdown, try ''unchecking'' the box for Site Preferences and see whether that helps. orange Firefox button (or Tools menu) > Options > Privacy