Hi, there are several threads with my problem, but none of the solutions worked. Here the problem: I use VPN for a certain database. The site requires authentication, even within vpn, which is not bad. Authentication happens through a small popup window. Each and every time I enter my credentials, Firefox springs back to this stage until my account is locked. Edge or Chrome do not have this problem. I use MS Edge under Linux, only for this one website. I already tried disabling my extension, cleaning my cookies, starting login on a freshly installed Firefox, nothing helped. I would appreciate any hint not related to the steps already mentioned. Thanks and regards Tibor Anca