I'm using the new Edge on my 2011 mac, which doesn't have the new dark mode, available in macOS Mojave onwards. Since Edge doesn't allow installing themes from the chrome web store, I'm now left with an ugly looking browser UI, which is completely white. More discussion on this topic here.
Today, while using an "In-Private" window on Edge, I found out that this window UI is completely dark, and this is exactly how I want the UI of the regular (non-private) windows to be. For comparison -
Regular Window -
In Private Window -
So now I know that it's not a system limitation because the in-private window does have a dark theme. Is there a way to make this theme applicable for regular windows too, via some config flag maybe?