This morning, everything that was in my exceptions list has suddenly disappeared. This list took years to compile. Thanks a lot Mozilla. Nothing special happened overnight as I simply put the computer to sleep before I did.
Solved! Go to Solution.
Saw you were having a really tough time and getting "technical" responses. In case you weren't able to get this fixed, I finally found a way:
CLICK ON: TOOLS CLICK ON: CLEAR RECENT HISTORY UN-CHECK: OFFLINE WEB SITE DATA and SITE PREFERENCES
This took care of the issue for me, I'm sure it will for you too.
You can try to restore the permissions.sqlite file from the Time Machine.
You can use this button to go to the Firefox profile folder:
So, I'm supposed to learn all about a whole new piece of unrelated software and all of its intricacies, etc, just because your mal-functioning software doesn't work right? Really?
computers don't always work perfectly & files on a harddrive might get corrupted. cor-el has pointed you to the file which stores all the site-permissions and exceptions for the firefox browser and the location of your firefox profile folder, where it resides - in case you can restore it through your sytsem's integrated backup software you might recover this data, but it obviously requires some efforts...
you'll have to try to restore the file named permissions.sqlite located in your profile folder from a backup prior to the date when your custom settings vanished.