Tree-style-tabs alone make firefox preferable. though their stupid mobile extension change dampened the ease to recommend it for mobile. (yes, I use nightly, and have a custom package, it's a garbage experience)
Oh god. I love that you said this. Absolutely. I have 3000 tabs open (exageratting but can't be too far off) and Tree Style Tabs saves my life. Along with Tridactyl, using the browser feels far more "powerful" than Chrome ever did to me.