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Yeah I guess the few people still using it can modify the source code and compile it...

That's essentially what Librewolf is.

Are they good about staying up to date?

Reminds of the days when any complaint about a missing video codec in Linux used to be met with "write and compile your own kernel".

So... bearing this in mind, did Linux fail?

it did, on the desktop

And eggs crack when you drop them from waist height.