I wouldn't say so. Firefox ESR 45 is good for support into 2017, and after that there is the possibility of someone compiling Webkit to work on Snow Leopard. I've seen a Snow Leopard version of Leopard Webkit available already, but right now there doesn't seem to be any need to keep it up-to-date.So Snow Leopard users are ****ed, basically.
Running TenFourFox in Rosetta is another possibility, although one that should be avoided if possible due to the performance hit the PPC emulation causes. TenFourFox Intel would be a good way to solve that problem, although as the blog post said there are problems that occur on both PPC and Intel Snow Leopard building Firefox after ESR 45, meaning TenFourFox is pretty much stuck on ESR 45 and will only be able to port over some of the new features in later versions.
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