Firefox forgets preferences on every update. Firefox plugin settings are also forgotten.
Reporter, could you please provide additional information, including: - Exact FreeBSD version (uname -a) - pkg version -v output (as an attachment)
Created attachment 209851 [details] pkg info requested
(In reply to Kubilay Kocak from comment #1) All FreeBSD versions affected (this has always been a problem). Currently 12.1-RELEASE r354233 pkg version info attached
Maybe your Firefox profile is corrupted. Can you reproduce with a fresh profile? $ mkdir /tmp/test_profile $ firefox -profile /tmp/test_profile $ pkg upgrade $ firefox -profile /tmp/test_profile