Our team has basically abandoned Firefox in favor of Chrome. Our team consists of front-end, HTML/JS/CSS types as well as server-side devs. I'm surprised, but every member of the team independently has punted on Firefox. For some, it was the extensions. For others, it was the RAM consumption.

With the new release schedule, it seems every time I would open FF with a new version to pull, some extension no longer works. It's purely anecdotal, but it was enough to annoy the bejeezus out of us that we simply switched over to Chrome.