Chromium Edge support doesn't work too well, when you have the window active it obeys the color scheme you provide from Curtains but as soon as you go to another window it loses all color settings. That's jarring since I have a dual-monitor setup with Chrome Edge windows on both monitors.
If you mean the tabs go white then this is a known issue and there is a workaround you can use right now or wait for us to add this to an update.
In the registry go to HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\DWM
Create a value AccentColorInactive as a DWORD and set this to whatever colour you want the inactive tabs to use.
This should instantly take effect. To revert back to default behaviour just delete this value.
This assumes the style you are using doesn't set the option to not apply colour to frames
