Hi zeyyix, both of those settings, along with many others, such as your pinned tiles on the Firefox home page, are stored in a file named prefs.js in your profile folder. It sounds as though there is a problem with prefs.js retaining your settings, or perhaps that file is getting removed for some reason.

Firefox will create a new file if you use the Refresh feature. Of course, that also removes your add-ons, so you would notice many more changes.

Some users reported that severe system crashes caused Firefox 67 to generate a new prefs.js file, but presumably you aren't having power outage or blue screen crashes at each update.

The following article lists a range of possible reasons for problems with prefs.js, so please have a look here and see whether it helps: How to fix preferences that won't save.

Back up and restore information in Firefox profiles.{web link} I use an add-on that makes backups of my user profile, Just In Case. Unfortunately, it is not compatible with the current Firefox.

Every now and then, open the profile folder and create a copy of the current profile as is to another location on your hard drive. This way you will have a backup.

If you do this each day, you will not lose much data. This should be done with Firefox Closed.

Note: In case you need to restore from these backups, you may need to overwrite old or corrupted files.