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Re:Choose Firefox Now, Or Later You Won't Get A Choice (2014) by amelius on Friday January 06, 2017 @05:40AM (#13335344)
On Linux the difference is 10px (FF versus Chromium), [1].

[1] http://imgur.com/a/TX7Qm

Re:Choose Firefox Now, Or Later You Won't Get A Choice (2014) by cornedor on Friday January 06, 2017 @08:40AM (#13336112)
You could try the developer edition, the default theme is more compact, even smaller than chrome on osx. (you can choose a dark and light theme in the developer tools)

http://i.imgur.com/jsvfSvU.png