I think Chrome and Firefox each have their own strengths, but Firefox is really great for any kind of layout/styling work. Grid inspector is fantastic.
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FF has dedicated tab for accessibility which shows accessibility tool and how each node is behaving.
FF also has dedicated tab with sliders to play with font size, line height, weight etc. With drop down of switching between different css units.
It also gives very dev friendly view of flex and grids. This helps a lot in debugging.
I think Chrome and Firefox each have their own strengths, but Firefox is really great for any kind of layout/styling work. Grid inspector is fantastic.