Chrome does a fantastic job rendering pdfs very quickly.
Why do you continue to use that pathetic browser?
I use both browsers. I use Chrome mostly for google sites, and anything that won't load in Firefox. I use Firefox mostly because I want Chrome to have competition, but also because noscript is still better on FF than on Chrome. And also because chrome's built-in cookie control is total shit which breaks sites so you either don't use it or you have a hard time with many websites, but cookiesafe works great all the time.
Plus it has proper side tabs with the Tree Tab control. Something chrome removed a couple of years ago.