I think I found the solution. I set Firefox to start always in private mode and thats why the exception could not work. Tested now 30 min and for now it is working.
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Heyner | Customer Care
Hey Heyner,
thanks for your answer but unfortunately that did not solve the problem. It still forgets my address, and it also shows me every time the „Set permissions“ screen. To give some more information: MyFirefox is set to delete all data automatically incl. cookies but with one exception of the Lastpass cookies. Maybe this is a help 4u.