How to decode this ----> ******* into abcd123
Ok, great question. I will refer you as A, and you have friend B that have access to your computer (limited or admin).
This is the case, since B is able to use your PC, he/she can plant key-logger that will logs all what you have type. BTW you type ******* isn't it? So it will logged.
In-case you not typing it, B can logs all outgoing traffic (such as specific from your favor browser).
Or you are not cleaning your PC very well, so B can find some logs file and read it using tools.
Firefox built-in internal password can be broken too, so does others. Please note, if you use the right tools.
Then you said, "But B is just MORON!"
Well, I will say ...
How do you know B is ----> *MORON* since hackers wannabe are all over the place.
BTW there are programs that can read ******* , just Google it.