Add-ons are a big cause of slowdowns / memory hogging with Firefox.
Mine is loaded with ad blockers, noscript, ghostery, https-everywher, cookie privacy etc. But in this instance I would go 100% over Chrome even if it meant production was 50% slower.
Don't forget that you can optimize Firefox for better performance. Look at add-ons fasterfox / fasterfox lite.
Oh. And I doubt Chrome would allow add-ons such as OptimzeGoogle? :-)
I like the way FF 15 (I think this is the version that started it) allows you to enable / disable add-ons on the fly without restarting. This is essential if you want to check your adsense reports.