Overall great effort i have to echo what Miron was saying though.
The dark theme looks rly strange to me.
The main issue in my eyes is the contrast between the file in the debugger and the side panels.
When i go for a dark theme i always enjoy when its kind of an immersive experience.
The current colors breaks this sadly.
Rest as far as i can tell looks good.
Not sure what version of the firefox developer edition miron has but that looks great.
I checked in chrome and they also use the same colors to create the same sort of immersive experience.
Lets me know if there is anything i can do to help you. i am in slack (Anzumana) of the debugger. team