
phillipp, I followed your initial suggestion.
don't open new threads about the same issue but continue at your original question at https://support.mozilla.org/en-US/que.../1122775
It was bad advice. The many steps lead to a dead end.
Simply ENABLING the KASPERSKY PROTECTION extension resolved the problem.
''don't open new threads about the same issue but continue at your original question at [https://support.mozilla.org/en-US/questions/1122775]''
It was bad advice. The many steps lead to a dead end.
Simply ENABLING the KASPERSKY PROTECTION extension resolved the problem.
Modified