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Why doesn't the AppCenter download the latest version of Firefox 49.0.1? Is there a way to install it?
Ubuntu maintains the Firefox package that elementary OS uses (both in apt install and in the AppCenter). Ubuntu is pretty good at keeping it up to date.
In this case 49.0.1 is only an update for Windows, so it shouldn't be of much importance. But you can download the binary and install it over your old release if you want.
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