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It works fine in Firefox, I do it for the intentional isolation. To me, chrome browser is "google browser"

Almost everything runs just fine in Firefox.

Google software seems to be chrome-optimized, but it's usually only slightly slower on Firefox - it still works.

Some google websites are chrome only because of the use of some non standard plugins.

Do you have any details of which ones? I have not discovered any so far - everything seems to work just as well in Firefox (e.g. gmail, youtube, search, maps, adwords, adsense, analytics, cloud console, webmaster tools are the ones I requently use on Firefox with zero issues)

Google earth and Google hangouts

It works, but it uses non-standard extensions that are only present in Chrome, so it runs slow in Firefox, especially since their latest update.