Google says: "We encourage everyone to make the free upgrade to modern browsers -- they’re more secure and provide a better web experience overall."
First, this simply is not true. Beginning with version 29 (which is now 3 or 4 versions out of date already), Firefox completely fucked up their browser and turned it into unusable garbage. Newer is not better. Newer is demonstrably worse. If I wanted a shitty browser with extremely limited configurability, I'd use Internet Explorer.
Second, you should be able to view any web page using any browser released in the last 5 years. If something doesn't work properly it means you are putting too much fucked up bullshit into your webpage.