Some number of Chrome-based web browsers is installed to Manjaro. In parallel to this same set of Chrome-based derivatives is installed to Ubuntu 20.04. Problem described here can be observed only for Manjaro.
Every web browser mentioned is configured to minimal feature set, high number of features is disabled, especially password store. The same configuration on Ubuntu side (comparison test).
When user starts one of browsers mentioned the browser opens pop-up asking user for keyring password. User declines. Pop-up opens up to 3 to 4 times. It is highly annoying as neither browser configuration nor user handling call for password usage. It seems to be a matter of how Manjaro compiles or configures these browser packages. Opera, Brave, Vivaldi, Chromium.
If you are on XFCE try to enable GNOME services ( go to settings/session and startup and under advanced tab click on launch GNOME services on startup checkbox).