Well kind of for Firefox, there is this profiling tool which you could use (semi-built in) https://github.com/firefox-devtools/profiler https://github.com/fire

Well kind of for Firefox, there is this profiling tool which you could use (semi-built in) https://github.com/firefox-devtools/profiler https://github.com/firefox-devtools/profiler. Which let you save a report in json.gz format