I use firefox mainly for hierarchical vertical tabs (tree style tab plugin). I often have up to 50 tabs open at once, which is unmanageable in ie/chrome. Also s

I use firefox mainly for hierarchical vertical tabs (tree style tab plugin). I often have up to 50 tabs open at once, which is unmanageable in ie/chrome. Also session manager is amazing, never have to worry about losing tabs. I also like how firefox loads tabs on demand, unlike chrome which opens them all when you open the browser.