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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def load_mozlz4(self, path):
 """Load a Mozilla LZ4 file from the user profile. Mozilla LZ4 is regular LZ4 with a custom string prefix. """

        with open(self.profile_path(path, must_exist=True), 'rb') as f:
            if f.read(8) != b'mozLz40\0':
                raise NotMozLz4Error('Not Mozilla LZ4 format.')
            data = lz4.block.decompress(f.read())
        return data