Me too, I moved to devtools about a year ago. I was particularly happy with the Cause column in the network tab that tells me why a particular thing was loaded

Me too, I moved to devtools about a year ago. I was particularly happy with the Cause column in the network tab that tells me why a particular thing was loaded, which line of javascript or which HTML element triggered it. I think Chrome has had that for a while, but it's pretty recent in Firefox. It's one of those little things that make me happy.