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You'll have to deal with warnings from websites that you're using an "insecure" browser. And eventually it will stop working at all because it lacks features that web developers assume everyone has.

You can disable most of Australis with a bit of css, so using firefox 24 for that reason is pretty heavy on the cutting off your nose to spite your face.

Or go Pale Moon, as it forked off from around that point but has gotten security fixes etc.