Firefox profile lz4 de-magicker from mossop

unmagic.py

    #!/usr/bin/env python
    import io
    import sys
    
    import lz4.block
    
    MAGIC = b'mozLz40\0'
    
    for path in sys.argv[1:]:
        with io.open(path, 'rb') as f:
            magic = f.read(len(MAGIC))
            if magic != MAGIC:
                raise Exception('Bad magic number')
    
            print(lz4.block.decompress(f.read()).decode("utf-8"))