when someone login his or account and forget to sign out then you can easily login his or her account. but you will never know what is his actual password.
Don't worry I'm going to tell you how can you see the password ( ● ● ● ● ●● to 123abc)
Requirements: 1. Any account already logged in. 2. Opera / Chrome browser
You can see anyone's password, It's so much easy method just follow the instructions:
This is the situation. Someone checked mail and maybe he clicked on "remember password" that's why after log out password still showing but it's not visible. I'll show you how can make it visible.
Step 1 : Mark the password and right click and goto inspect elements
Step 2: You will see Inspect Elements, input type="password"
Step 3: click on "password" delete/replace it on "text" and then press Enter 
If you have any question, you can ask me :)