yeah... I tired to extend Spectors ui, the code base is "interesting" for simple changes seemed way harder than it should have been. Shame though as its really the only tool like it for web.

My favourite though is safari, graphics driver crashes all the time, the dev tools normally crash as well, so you have zero idea what is happening.

And I've found when the graphics crash the whole browsers graphic state become unreliable until you force close safari and reopen.