I use Firefox on high privacy settings but that breaks some sites so, when necessary, I use Iron. Iron is a less spy-y version of Chrome which has all the same apps (and a handful of its own).
I wasn't suggesting the OP should use Iron instead of Firefox. I was pointing out one drawback of (locked down) Firefox and noting a slightly better alternative to Chrome which has all the functionality and less of the spying.
My choice is to use both because a very small proportion of sites won't work with Firefox on high privacy settings. Sites which force me to use lower privacy standards are used (quarantined) in a separate browser.