shortkey "n" doesn't work any longer in Thunderbird
Usually I can go to the (n)ext unread message while pressing 'n'. At TB 45.5.1 this doesn't work any longer since TorBirdy is installed.
Although I do get the popup window "Advance to next unread message" and pressing "Yes" TB doesn't do it.
Deactivating that particular AddOn helps and the functionality is back.