Some recent nightly has resulted in cookie overrides data getting lost. I just tested from latest nightly 68 20190508111321 by adding Allow https://bugzilla.mozilla.org with "Delete cookies… when Nightly is closed" and restarted and not only did I lose my bugzilla cookies, the permissions shown in "Cookies and Site Data > Manage Permissions…" were all gone.

I was trying to bisect but can't reproduce on a clean profile nor a new profile where I copy over my prefs.js. I'm guessing it's something specific to a storage file in my regular profile… ?

Copying over my regular profile's permissions.sqlite to a local build's profile reproduces the issue. And deleting permissions.sqlite avoids the dataloss. Bisecting now…

baku, bisected to bug 1320404 with my permissions.sqlite. Do you think you'll need my file? Or if I should try to reduce the entries to see what's triggering? In the process of bisecting, the older builds show the permissions fine, so the data is still in the file.

Perhaps a dupe of bug 1549912 where generally it seems like permissions are not read / written to permissions.sqlite anymore