Yes, i primarily use ff dev tools. And it has greatly improved in the last couple of years. But there are still some shortcomings. For example websocket frame debugging is just barely on nightly. Load time for a web app with thousands of unminified sources with devtools open is terrible. Plus a bunch of small annoyances. It's not so bad i won't use it. But it does make me wish firefox had the same resources for devtools that google does.