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what is the most updated version for my macbook
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Your versions is 115.45.0esr and is probably the best you can run on your macOS 10.13.x — see Firefox users on macOS 10.12, 10.13 and 10.14 moving to Extended Support Release
To upgrade to anything more current, you'd need to be able to install at least macOS 10.15 on your machine.