The profile folder is all you need to create another stable profile,if your existing one gets corrupted.
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support.mozilla.org/en-U ··· ser-dataUsing Febe or just manually making a copy of that profile folder is the easiest way to keep all your customized settings,bookmarks,etc.
To me Febe is a must have extension,if your existing profile gets corrupted,it's as easy as creating a new profile and restoring a backup to that new directory.
You're up and running in minutes.