While exploring an site with links to "Facebook" (I plead the 5th!
I was concerned that the prior "temporaries" would import as "permanent", as they appeared similar in the ".txt" backup. This apparently was not the case. All was well again with the whitelist, and their was much rejoicing.
However, ... all the permissions in all the currently open tabs were reset, requiring the "refresh" of each tab (all 16, in two windows). Of course, a quick restart of Firefox would accomplish this.
Should the permissions for open tabs have been automatically refreshed after import of the whitelist ?