how do we investigate how many times a browser is doing reflows?

Question

Is there a web developer functionality/tool that allows us to know how many times a browser is doing reflows?

basically I want to have some sort of feedback/informa

Answer 1

You can track reflow information if you have a custom built Firefox.

see below: https://developer.mozilla.org/en-US/docs/Debugging_Frame_Reflow

How to build Firefox with enable debugging mode: https://developer.mozilla.org/en-US/docs/Developer_Guide/Build_Instructions