Hi! There is a dark theme! 
Go to any project, open the editor, click settings and check the box for toggle light/dark theme andā¦ tada! You now in the dark theme! 
As for tabs, yepā¦ they donāt have this, but this would be a great feature!
Hope this helps 
wh0
4
additional folk remedies if you havenāt tried: you can open multiple browser tabs of your project.