I am developing an Angular App which uses a web-socket for backend communication. Interestingly, whenever I open the app in firefox (localhost:4200) the navigation bar breaks. I can't change the URL manually anymore, but every time I submit a changed URL it first redirects to the specified page but then immediately overwrites the navigation with the previous URL. Example: # Call http://localhost:4200/ # Sometimes the first additional navigation works, but afterwards all manual changes using the address bar will result in the behavior shown in the below image. Steps I have taken to narrow down the error cause: * I ruled out a device specific issue, since the problem occurs on both my machines. * It is specific to firefox, since both edge and chrome work perfectly fine * I don't think it is related to the angular router and the way I use it, since it would be quite weird that a website could force a user to stay on it. * It is not related to the Angular CLI since the error also occurs when I deploy the angular with nginx. I haven't found any hints on what might cause this behavior or even how to debug the network traffic further to maybe see what is causing the navigation override.