Used all the "relevant" guidance found on community forums to no avail. For Weight Watchers and only Weight Watcher's Site, my log in viz user name and pass word information is not retained for each Firefox initiation. I have the latest version of Firefox. Previously cleared all caches, all cookies. Previously disabled all tracking and ad blockers. Can successfully accomplish this with Microsoft Edge. Can use any other booked marked site reliably to enter without log in name or password. Will switch browsers if this cannot be corrected. Very fustrated.