Hi IshaqueJuel, to view a password saved in Firefox's built-in Password Manager:
- Windows: "3-bar" menu button (or Tools menu) > Options
- Mac: "3-bar" menu button (or Firefox menu) > Preferences
- Linux: "3-bar" menu button (or Edit menu) > Preferences
- Any system: type or paste about:preferences into the address bar and press Enter/Return to load it
In the left column, click "Privacy & Security".
Then on the right side, click the "Saved Logins" button. Then click the "Show Passwords" button.
If it's not there, it's probably not saved in Firefox, or let us know some more details about where you think it might be.